ANDYF  Finally got it emailed to me by friend and tried to start - widget starts but doesn't allow to even get to settings without first connecting to developer's site.

It is a complete BS as I cannot connect at all to developer's site - times out all the time. Maybe due to location where I am at the moment - but having it work or not work depending on location and ability to connect to developer's site is ridiculous. I'm on the road a lot and have no problems using other gmail checkers, including dashboard and yahoo widgets, even from locations I can't connect to developer's site.  
(Version 2.0)

ANDYF  I'm still trying to download it or find alternative download link as the developers site times me out all the time.

But I have the question that is important to me before I decide to use widget anyway:

Description says it launches browser and logs into the account as well that widget supports multiple accounts - so, is it possible in current version (or can it be made possible in future versions) to set different browsers to launch for different accounts?  
(Version 2.0)

ANDYF  Is there an alternate download link?

I can't get to http://threetree.net - timeout every time I try.  
(Version 2.0)

ANDYF  Wow! I love it!

Until now I used Yahoo! Alive Clock widget, but not anymore. SFC is more customizable and has smaller footprint.

The only problem I found it - after initial change of settings I can't launch settings anymore. Any hints?  
(Version 1.6.2)

ANDYF  Decided to use build in uninstaller and then after restarting my Mac (just in case) I installed again Leopard version.

This time the registration window pops up asking me to register it. So, I typed data from my license purchased back in 2004 (version 3.4.9) and got reply that serial number is not valid. The only option left is to Quit, Uninstall, Buy or Register.

Mr. Szymanski - please help.  
(Version 4.0.1)

ANDYF  I was using Cocktail since it's inception and was more than satisfied.

The Leopard version stalls on any task performed and becomes non-responding and I must force quit it.

Any clues?   
(Version 4.0.1)

ANDYF  I wouldn't phrase it the way you just did scottyarch. It suggests that GUID is not required for PPC but bootable. It is not, you cannot boot PPC from external GUID.   
(Version 0.6)