DOUG S.  While I prefer this to other solutions I've seen in some ways I still use alternatives if only because (1) they support multiple accounts—I have four—and (2) this has no support for Growl, something I find extremely surprising.  
(Version 1.10.4.676)

2SHAE  I like this app, but recently my Google Notifier quits by it self. It just disappears from the menubar.

Also, it's to bad that it doesn't check every minute anymore. Sometime it takes 10 minutes before it checks...kinda ridiculous.  
(Version 1.10.4.676)

SHARPIEEE  as has been mentioned by others, this really needs a few more options in its preferences window. i'm kind of confused why google didn't provide more choices. i personally don't need my notifier to check every minute, or every 5 minutes for that matter, and yet there's no apparent way to choose the time between checks. i also had frequent problems with the notifier glitching out, weird problems with the email checks failing and never starting back up, etc. its a great utility to have, i just hope google puts a little more polish onto this.  
(Version 1.10.4.676)

RORO01  BEWARE!!!

This version checks for mail every 5 minutes as opposed to every minute in the previous version. It would have been better if the developer had given us the option in Preferences to choose the interval like in Apple Mail.  
(Version 1.10.4.676)

MACUPDATE ADMIN  The download link here at MacUpdate points directly to the Google server, you are downloading Google Notifier from Google and there is no Google Updater app installed, only Google Notifier.  
(Version 1.10.2.580)

FREEBSD  Google Notifier downloaded directly from Google will avoid the Google Updater junk that you can read about in several other reviews.

That aside, once you actually get the Google Notifier.app installed, you may encounter the same problems that I have seen with respect to latency, redundancy, and time outs.

I assume that Notifier checks for new mail each minute, which is a fixed time that has no easy preference change that I can see. However, this operation times out frequently (several times per workday), irrespective of the state of my internet connection, which is fine and always on (and working during these time outs).

Additionally, Google Notifier will from time to time ask for my login credentials again, to erratic behavior. When it asks for this info, pressing cancel seems to have the same effect as pressing OK. Yet the annoying pop up dialog box invariably disrupts my work once or twice a day.

Finally, I have noticed that, though it looks to have been checking successfully for new mail within each minute and finding nothing new, checking Gmail manually in a browser has sometimes yielded new mail that is greater than 1 minute old. It looks like Google Notifier just missed this mail. It's unclear whether or not Notifier would have eventually found it, as manual checking from Notifier did not find the new mail. Strange.

I do find this app better than the other ones I've used, for simplicity and size. However it's imperfect and could use a more rigorous testing and release schedule to be truly useful.   
(Version 1.10.0.522)

JQMUSICMAN  Mail notifier doesn't work with Google Apps hosted mail. Gives no error at login but never alerts on new messages. Totally lame.  
(Version 1.10.0.522)

LARRYMCJ  Using this with Camino and the green notification icon with the exclamation point just stays on top of the Menu Bar Notifier icon.   
(Version 1.9.97)

ELEVATORIUM  I'm pleased this works with Google Apps for Your Domain. Good stuff, and best of all, it's free! :>  
(Version 1.9.97)

SWGS1  I use and enjoy the Google Notifier software, it works as advertised, and I'm glad to see Google doing more Mac software. But, the older version was able to use Growl notifications, which I prefered over the homegrown solution that is now included in Google Notifier.

Until google starts supporting Growl notifications instead of their own system, then I'll just use this without the visual notification, and just have it in my menubar. I know this is a minor thing to gripe about, but it matters to me, I don't want two different kinds of non-standard screen notifications.

For those that aren't familair with Growl, go to http://growl.info  
(Version 1.9.90)

KATABIOS  work like a charme! some hope for a multiple accounts version?  
(Version 1.9.90)

GENERAL  Previous version kept asking me for password. This version fixed that issue, but still - if I want to create calendar entry from menu icon - web page displayed does not comply to my regional settings. I live in Europe and I wouldn't use calendar in which starts on Sunday.

If I create the event via Google Calenar - all is well, but if I invoke it from menu icon - it defaults to American settings. I'll stick with Gmail Notifier, still works for me :)  
(Version 1.9.90)

ST00P!D M0NK3Y  This release seems to have fixed the issue of not going to my inbox when I select to do so. All the functionality works now, so yay! Thanks.  
(Version 1.9.90)

SWANKSALOTJR  Works ok for me (1.9.65), but I upgraded from version 1.8x.   
(Version 1.9.65)

NEMESYS  1.9.65 seems to be having the same problem than 1.9.63. Basically, if you try to access your Inbox or compose or try to read a message from the Gmail menu bar item, nothing happens if Google calendar notifications are off. I don't use the application in the Dock so I don't know if it works from the Dock or not.

However, somebody emailed me a fix yesterday. Go in the Preferences and turn on the Google calendar notifications. A page will open in your default browser and you might be prompted if you want to activate your Google calendar. Just cancel. Go back to the Google calendar notifications preference and turn it off. Now, whenever you choose something from the Gmail notifier menu, it will open up correctly in your default browser.  
(Version 1.9.65)

NEMESYS  Don't replace 1.9.61 with this version 1.9.63. This new version can still notify you when you receive new email but none of the menu items to let you access your Gmail account work anymore, while 1.9.61 was fully functional.  
(Version 1.9.63)

ANDRE.AMBROSIO  Same as so many others, this program is absolutely not useful for me. Although it looks better then the old Gmail Notifier, it simply does not work. The calendar part of it keeps asking me for login, the compose and all other buttons that link to gmail also don't work. I hope google fix it soon, because I have deleted my old program file.  
(Version 1.9.61)

THREEDEE912  Help! I still am using 10.3.9, and deleted the old Gmail Notifier because I didn't know the new version was for 10.4 only! Does anyone know where to get the old version?  
(Version 1.9.61)

JOSH LINDQUIST  This is very useful. I haven't had the login problems (thankfully, keeping my fingers crossed) as many other people have. One thing that is a little troublesome is that when I click on the menu bar icons they don't always respond right away, and I need to click them two or even three times..  
(Version 1.9.61)

MACPI  The previous version (1.8.2) had absolutely no problems, but this new one keeps asking my login data. It happened on both my Macs (office and home) and I had unfortunately to switch it off for the moment, waiting for a quick solution...  
(Version 1.9.61)

ZETSURIN  The calendar keeps asking me for my login account even though I can log in using the same details directly at calendar.google.com.  
(Version 1.9.61)

UMIJIN  This release appears to be buggy on my G5 iMac. It infinitely keeps requesting my gmail login info over, and over, and over...

Gmail Notifier still works fine, however.

Please address this issue, as I'm likely not the only one experiencing it.  
(Version 1.9.61)

GCOGHILL  This is excellent and woroks great with the GMail + Growl app: [url]http://www.macupdate.com/info.php/id/19508[/url]  
(Version 1.8.2)

ROBACKJA  On the PowerMacG5, Gmail Notifier will not ify me of new messages. I been using 1.8.2 for quite some time. On my MacBook Pro, it works fine... :(  
(Version 1.8.2)

PERCOLATOR  Apparently this new version has issues with the notifying. I can link to my account, but it doesn't notify me of new messages. A quick surf around seems to confirm it for a lot of people...

As Google had never let me down yet, I trashed the old version and upgraded. Whoops. Now desperately looking for an installer for the last one.  
(Version 1.8.2)

TARIK74  I've been using this for months now but today it quit receiving notifications ? what could be the problem?  
(Version 1.8.2)

SOMEONE  Works as advertised: checks your gmail account every 2 minutes, can act as your default email program and has Applescript and plugin support!

While version 1.8.2 brings new icons and update notification, it now uses plain http access instead of https (encrypted) access. The new icons also fail to blend in with the other menu bar icons.  
(Version 1.8.2)

NOSPAM1  Good app - but I wish it didn't log to console every time it checks for mail (annoying for those of us who have the console pop-up every time something is logged.)  
(Version 1.7.7)

ANONYMOUS  I have been relying on this program since it was released, unfortunately it seems to have suddenly quit checking new e-mail properly. Perhaps due to some change in Gmail? I hope the notifier is updated.

Also, if others are having the same problem, or if, on the contrary, it's just me, please say so.  
(Version 1.7.7)

ANONYMOUS  Maybe it might be possible to add an option to see the number of "Starred" emails?  
(Version 1.7.7)

ANONYMOUS  Never got POP to work with Gmail. If you know how mind helping me?  
(Version 1.7.7)

ANONYMOUS  It's ugly looking, especially the error symbol. Needs to be cleaned up a bit. Besides that though, it's good.  
(Version 1.7.7)

ANONYMOUS  Works great. Only problem I have is that I have no idea how often it checks for mail. No setting to change the minutes between checks or anything. Not sure what's up with that. Otherwise it's perfect.  
(Version 1.7.7)

ANONYMOUS  great program, but i still prefer enabling pop access and using Mail.  
(Version 1.7.7)

ANONYMOUS  I like this for 2 reasons:

First, the icon fits the menu bar well... some of the others I've seen are too gaudy. Second, and more importantly, since this is an actual Google application, I see much less chance of it ceasing to function, which was the main problem with 3rd party solutions.  
(Version 1.7.7)

ANONYMOUS  i think i like Gmail Status better. But Google did a good job  
(Version 1.7.7)