I play Wave Race, Burnout, Rogue Squadron, TimeSplitters, Eternal Darkness and other great GameCube games on my Wii occasionally.
I had my N64 out to play F1 World Grand Prix 2 a couple of weeks ago.
I have a few VC games too, but the only ones that get played often are Sonic, Lost Levels and F-Zero X. (though SM64 has the most playtime it was done in a few long sessions rather than occasional)








