My links for the Wii
Mostly the links + text was pulled from some googling about...
Email me if you find more!

Rochester McGinn dot com - optimized for the Wii
Maybe the largest collection online, WiiCade offers games of every genre, and is a worthy first stop.
The well-done cartoon style of the YatSha site and games make this a good stop for kid-friendly games.
With beautiful art direction and sophisticated music, some of the games at Orsinal are like pastoral paintings come to life.
Wiiplayable = Another game site
Miiboard - not sure on this!