E.S.
I know you've already gotten good responses, but I'd like to expand on the Wii Fit. My 3 kids LOVE IT! They are 8, 6, 3 and even the 3 yo has fun with it. Mostly they do the balance games which are the "fun" ones, like they have to walk a tightrope, or they're "dressed" like a penguin and have to catch fish. My 3 yo thinks it's hilarious when he tries to do the ski jump and ends up tumbling down the hill in a snowball! And as you mentioned, they're are quite a few driving games that are great for kids (I'll admit I'm addicted to Mari Kart). We love it as a family, and it's something different to do on a yucky night than just popcorn and a DVD.