Wii Fit

I bought a Wii Fit yesterday and absolutely love it. It's so much fun. I can't push it too much because of the recent back surgery but I think it will be a good way to slowly build up my core muscles. My favorite game is the hula hoop. Danielle laughs hysterically watching me because for some reason my right arm goes out of control the faster I hula but that's part of the fun right?

I know Wii's can do some pretty interesting things like connect with other people so you can play each other from your own home but I have no idea how to do this. I've also been told I have a Wii number. Any info on this and the other capabilities of Wii would be appreciated.