FREVOI  During the next week, you can get it for free at http://www.macheist.com - If this is considered spam, please delete it, but I think that this is a really good tip. ;)  
(Version 3.2.1)

PAGUCA  they should implement facebook right now.

im not using it anymore because of that  
(Version 3.2)

RPLUSJ  Twitterrific is an excellent desktop solution for Twitter, especially for users who are looking for a minimalistic user-interface and have no desire to spend hours every day organizing follower groups or engaging in endless back-and-forth conversations.

If your workflow is like mine, you simply want to get your updates quickly and post a Tweet with as little hassle - and in as few key strokes - as possible. Twitterrific does this with a simple keyboard shortcut. It's easy on the eyes, well designed from a UI point of view, and is light on resources.

Sadly, the Mac version is being neglected by the developers and is lacking at least one useful feature for "speed" users, like myself... a retweet shortcut. Search would be a nice addition, too.

If you don't want to pay to register the app, Pwitter is a similar, free program, albeit not quite as pretty.  
(Version 3.2)

PENGUIRL  Twitterific for Mac seems to have stagnated as all efforts appear to be focused on Twitterific for iPhone. If the Mac version had the features of the iPhone version that would be great.  
(Version 3.2)

LANDI TRANCE  Twitterrific is the best i like it .  
(Version 3.2)

YOSHINATSU  I actually have had a really nice experience with Twitterrific, I don't even GET why Tweetie became so popular all of a sudden.  
(Version 3.2)

FROMAGE-HEAD  Configure to quit ?  
(Version 3.2)

GCOGHILL  I was hoping for a beefier feature list for this update. I like Twitterific (tried the rest, keep coming back) but it desperately needs a way to separately view Direct Messages and Replies (tabs, or whatever).

Including a URL shortener (choice of multiple services with account linking would be nice) is also something I would like to see, but not on the top of the list.

And while I am on the feature request soapbox, I'd also like to see an option to open links in the background, an "unread" count in the "title bar" (or whatever that top portion is on an HUD window). A pref to prune read tweets after X hours/days. And a pref to allow clicking of the Growl alerts to jump to the respective Tweet.

Some sort of Groups feature would be nice as well.

I did contact the devs a while back and was told that many of these were on the list for future updates, but was not given any sort of timeframe.  
(Version 3.2)

PENGUIRL  This update address' my primary complaint, which was all messages being marked unread upon launch. The addition of https communication is long overdue but finally included. It's the best Twitter desktop app for Tiger, and possibly OS X. My only complaint is that it is overpriced, really it shouldn't cost more than $10. If the ability to manage your Twitter account were included it would be worth it's current price.  
(Version 3.2)

MARTIN PALJAK  Fails with basic security and transmits passwords in plaintext. Never crashed, would be useful if done correctly. Inability to configure the SSL settings via GUI makes the ease of use bad.  
(Version 3.1)