Small annoyance: if you are using the 2.4 version of the Logitech Control Center , Growl notifications no longer appear. The solution is to remove /Library/InputManagers/LCC Scroll Enhancer Loader, log out and back in.
[From cocoaforge - A Festivus for the Rest of Us » View topic - Notification doesn't appear]
Update: this also has the effect of disabling custom button mappings set in the LCC: for example, I had mapped the thumb button to produce “Apple-[” to go back in most applications, and this no longer works. I still prefer to have my Growl notifications.
