I'm waiting for the Wii because Nintendo look like they are actually trying something different.
The other two look to be little more than retreads of where Sony and Microsoft have gone before but with a fresh coat of paint. Have there been any 360 games that haven't been just prettier versions of XBox games?
But, I shall wait and see what future games are like. I've not seen anything on the 360 yet that interests me except for the forthcoming Dead Rising. Can't beat mindless violence.
Also Sony will be using the PS3 to push the heavily DRM infected BluRay format. The next generation of HD disc formats have me somewhat concerned.