It's really a general OS question, but as long as the Finder and Terminal function as expected*, I'm happy with the OS itself. I've heard Mail has some import problems. I use GMail via the web interface and in Mail on my Macs and Outlook on my PCs, so I can tolerate Mail being unusable or quirky for a bit. But it's all about the apps, you know.
Specifically: Quicksilver, Virtue, Terminal, XCode, Photoshop CS 1, Fire, Photoshop CS, Acrobat 6 Pro, M$ Remote Desktop and Citrix Client. How do my essential apps hold up under Tiger? Any show-stoppers or other serious reasons to hold off on plunking down the $130 bucks until 10.3.1 or .2 is ready?
* "as expected" is, of course, left to individual interpretation