MTV.com seems to be the home of Nintendo Wii adverts this year. Following in the footsteps of the late May teaser ads, Nintendo now have placed rollover Wii ads on the site showing off gameplay movies for many top titles including Metroid Prime 3 and Super Mario Galaxy. There is also a sidebar which allows you to tell a friend about Wii, sign up to the Wii newsletter and visit the Wii site.
Nintendo also announced that the Nintendo Fusion Tour (a tour which combines music and videogames) will carry the Nintendo Wii in some form. No news on whether or not it'll be playable but it seems likely that this will be the first opportunity for the public to play a Wii. The tour is headlined by Hawthorne Heights and you can get all the latest info (including tour dates) on www.nintendofusiontour.com. Please note this tour is for the USA only, so if you are from elsewhere then please don't get your hopes up.
Stick with C3 for all your Wii news.