I installed Mac OS X Tiger yesterday on my Powerbook G4. So far, so good.
The performance of the system overall just feels “snappier”. Safari has an extra quick response now.
Dashboard is cool — we’ll have to see how useful it really is. I like the new Dictionary/Thesarus onboard. Spotlight is very nice — especially cool to have the new smart folders in Mail.
The UI of Mail is the only questionable aspect of Tiger for me. I liked the old interface – the bolding of mailbox names when there were new items, etc.
Had to clean up a mess in my iCal calendar – something I’ve been putting off. My calendar had entries back to 1998 which I’ve been carrying along since I migrated from Windows XP/Outlook 18 months ago. I used iCal’s export feature to save, year-by-year, from 1998 to 2004 — getting those entries permanently out of my iCal calendar. With those thousands of old entries gone, iCal’s working great.