Try out Secondlife, its really funny
So after I saw the press stuff from SUN Microsystems about second life, I immediately went and openend an account and whoa! Its pretty impressive. Whatever you are into, starting from art, going over shitloads of sex as one would expect to pure partying, its all there. You can get completely sucked into it so be careful 
. I have some fantastic friends in SL, the openness and friendliness off took me by total surprise. Big thanks to all of you, you know who you are SL allows you also to do your own things, services etc and trade them on the system. Its really really well thought through. I suppose soon also the smaller weirdnesses, like hanging animations, strange look of hands of avatars and so on will disappear. And there is over a million active users now ….