360 - I own (and I have always been a Sony fan, and I do not own an Xbox) Right now it is looking like I made the better purchase in getting the 360
PS3 - I want it, but I don't think I will shell out $600 just for the console. Adding on a game and adding on a controller, it just going to make it too expensive for me to justify. Also, as everyone has been saying, it is going to take a year or two before the developers really figure out how to code for the PS3, so I will probably wait two years before I get a PS3, and hopefully the price will be much lower by then.
Wii - I like the idea, I like the cost, I would really love to play a lot of the old games I played on Nintendo, plus I have always loved the Mario series. I will probably get this, but I will need to see it first person before I actually decide on getting it or not.
Overall, I think Microsoft has a huge upper hand right now. People that were loyal to Sony are not as loyal recently because of the price and because of the lack of delivery on the promises Sony has been making. Plus, 360 is already out there and is going to be well into their second year of having developers develop for the system; their games are just going to be ahead of Sony's for a few years to come.