We got a new Wii game called "Just Dance." It's a hoot. It's the best workout I've had from the Wii, way better than any Wii fit game, way more fun and less annoying. My 4 year old loves it. She does it while I cook, before school, or we dance together to the club hits from my dancing days. (Anyone remember The Nectarine in Ann Arbor??) It's fun hearing your kid rock out to "Pump Up the Jam." If you're looking for a fun and active game for the whole family, this is it!
(Wii FIT is to be approached with caution. Aside from almost every game being too complicated for my preschooler, it has terrible body-image implications.)