haven't had a chance to demo the wii. but the specs/concept looks interesting.
i own an xbox 360, and have had a chance to demo the PS3 - they are amazing as usual, but severely overpriced - especially the PS3. i understand that new tech costs more, but they are pricing themselves out of their main market. potentially, the only reason i would pay USD 600 for a PS3 (i paid 400 for the 360) is because of it's Blu Ray DVD capability but (a) we're not sure if that's the format of the future, and (b) the hardware and software (DVD's) are really really expensive.
personally, i hope the Wii is a huge success and steal market share away from the other two guys to force MS and Sony to really reevaluate their price points.