Friendster is another social networking website that's fairly popular. I'm not on it, but I've heard about it. If anybody is on classmates.com, that's a site that could have far-reaching impact, if ylou moved around a lot and attended several schools. You could reach friends from elementary, JH, HS, all your friends from other schools that were close by, any colleges you attended, and friends from the military, all at once.
For the pet lovers, there is also catster.com. In essence, you create a myspace for your pets.