Gmail RTF was supported. Google Docs no longer warns of an unsupported browser.
Blogger doesn't seem as messed up when using Safari (though it uses div tags instead of the familial p tags).
The only app that warns of an unsupported browser is Google Page Creator -- which is due to be dumped "any time now".
Google is very close to full Safari support, I'm going to try switching for a while.
I'll be happy to leave Firefox 2/Mac behind. It ain't so great on XP either these days! We need Firefox 3 ASAP.