I have all 3 systems too.
The wii is in the other living room hooked up to my old projection tv and my son usually plays it with his friends. I've played wii bowling and that's about it. I do see a ton of potential for the wii and I'm definitely looking forward to Mario Kart which will be online. Post your wii addresses so I can kick you asses on Mario Kart.
As far as the PS3 and the Xbox, (I convinced the wife to let me buy an elite when my first xbox got the 3 rings because it would better match the black entertainment center and tv) I love them both. As others have stated, xbox live is awesome and I can only hope that Home is comparable when it is finally released. There was no gamer point system when I was growing up and yet I had no problem playing games on any system. Now I find myself constantly at odds over which system to get games for. On one hand is my desire to see the better picture quality that is normally provided by the PS3 and on the other is my crazy desire to rack up gamer points. What the hell is that about?
Anyway, all 3 systems are great, and if it weren't for a few xbox exclusives that I want and the fact that my best friend hasn't made the leap to sony, I would probably sell the xbox.