Lesse...
Geometry Wars Galaxies - awesomesauce and sells for $20 new now if you can find it
Klonoa - rad if you've not played it on the psone already and can't get that version via PS3
Kororipna 1 & 2 - If you liked the acid trippiness of SMG you'll probably like these. Insane labrynth style marble rollin' which has been praised on here before
Mario is racing a Kart on Wii - the first Wii game to not have utter shit online via wifi. You probably already know if you want this or not. It's a Mario Kart game. On Wii. Yay?
Metal Slug Anthology - Do you like blowing shit up mixed with some wacky jappy comic style? Then you will like this.
Muramasa - like playing a Miyazaki film. Fuckin beautiful albeit a tad simplistic fun.
NSMBWii - a bit on the short side and more of a rental unless you're gonna fuck around with your buds lots.
NMH - The first one has more Wii-centric neatness but a bit more tedium via having to repeat jobs in order to raise the $$$ for fights. The second doesn't have as much tedium but also seem to have a bit less, shall we say, whimsy?

Ur Mr Gay - If you don't like this game I don't like you

Mario is Super, thanx for asking, also Paper - Was supposed to be a GC game and it shows a bit in the controls. Longer than NSMBWii so if you're out for more single player plumber shit besides the galaxy game this is the way to go.
Brawl - Brawl is fuckin' rad. Sure it's a bit stupid and 'not a real fighting game' whatever the fuck that means but it's, like, fun, man.
...That's about it for decent stuff that I am in posession of. If you can get homebrew going emulate the fuck out of the NES and SNES, a lot of the good shit on those machines still holds up.
spoiler (click to show/hide)
Unlike practically everything on the N64
