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My daughter played the Wii at a friend's house and has expressed a desire to have one. (Honestly, she's expressed a desire to have "every toy made for kids," so I don't know how much she really wants one.) I've had no interest in the system, but there are plenty of people who have told me it is really fun, and I'm starting to think it might be a good investment.
I haven't bought a PS3 for several reasons. Money, lack of exciting games, and lack of backwards compatibility being the main ones. At this point, I see buying a Wii before the PS3, though Gran Turismo is enticing.
If anyone reading this (all two of you) has a Wii and wants to throw in your opinions, feel free. I'd love to get more input before I make a final decision (I'm also considering a PSP for her).