Zoo Tycoon is great. I don't have it installed right now as I'm not playing it, and it's not a game I like to keep on the hard drive unless I'm actually using it. For some reason, when I run any sort of system scan (looking for spyware, errors, whatever), the scan gets bogged down in the Zoo Tycoon files and takes forever to wade through them.
I plan on picking up the sequel when it comes down in price and is inevitably bundled with all the expansions that will likely be made for it.
I'd like to get Sims2 sometime as well, I had fun with the first one. I like the idea of sandbox mode a lot as well.
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Eep! Phosphor, I meant Zoo Tycoon 2. I liked the first one well enough, though I'm not really a fan of the Tycoon games....but the sequel is just boring. It's fun enough switching it to picture mode using hotkeys when my sister's playing it and annoying her though.