Upgraded to Snow Leopard (Mac OSX 10.6) and so far things are smooth with some exceptions:
- My favorite utility, QuickSilver would no longer launch. Finally figured out that I not only had to trash the preferences file in the ~/Library/Preferences folder, but also the entire application support folder in ~/Library/ApplicationSupport/Quicksilver.
- Dymo Label doesn't work and there's no driver until "the early Fall which is December in developer speak. Not good.
- 1Password doesn't work under Safari unless you get their secret beta version 3.
- VMWare Fusion also needs to be updated
And one of my buds had problems with Mail.app -- turned out that RSS feed prefs didn't transfer over well from 10.5. He trashed them and it started working again.