Woah! Played Wii for about 4hrs now at in-stores. It is truly great. I have sampled Wii Sports, Wii Play and WarioWare (which gets boring after about 5mins). Wii Tennis and Bowling is soooo dam fun. Me and some mates were only able to sample 2 player mode, but with 4 wii-motes these games would be awesome fun (excluding Warioware) :P
One note tho, and I hope its only in these WiiPlay and WiiSports titles, the textures seem really low res, like the pool table's carpet looked like a straw mat! Meh anyway it IS tons of fun, and I am still amazed at the different age groups it attracts. An old grandma was mesmerised by Wii Pool for about 10mins.