Heh. That's interesting... When Pather came out, I saw it, and was amazed by it. I always thought, 'What would be really neat would be if I could "zoom out" and see all my windows at the same time.... and Panther had Expose, and I love it. I can't stand using a computer without it. To me, Expose was worth the price of Panther, alone. Everything else that came with Panther were just nicities...
Tiger, however... I dunno.... I have QuickSilver, so I'm not in any dire need of Spotlight... though, I think my parents are in need of Spotlight. And Dashboard? Ironically, I think I'll only use it if they make it so the widgets can hang around, just like Konfabulator.... I always thought Konfabulator was neat, but never that worth price of admission, considering there are other free utilities...
Tiger? Maybe. We'll see.