MLB.com's 'Gameday' no longer works. It uses to have pitch-by-pitch updates of any baseball game. In Safari 1.3 & 2.0 it loads, but just sits there. No updating.
PGATour.com has something similar (but heavily Flash laden) called TourCast, for shot-by-shot updates of golf tournaments. Safari 1.2 wouldn't even load TourCast (I used FireFox), but now version 1.3 & 2.0 load TourCast and at first appears to work, but it has the same problem as MLB.com's Gameday. No data is ever updated.
I haven't checked other sites' similar features on these sports and others, but I have a hunch I'll find similar results. So now with Tiger, I have to resort to an alternate, more compatible browser, MORE often than before. Seems like a step backward to me.