I could list a lot more than this but these are my favorites in no order and I moved 3rd party to thier own slot or non would be listed.
Nintendo
Donkey Kong Country Returns
New Super Mairo Bros. Wii
Kirbys Epic Yarn
Warioland Shake it
Mario Kart WIi
Sin and Punishment Star Successor
Super Mario Galaxy 1/2
Wii Sports Resort
Metroid Prime Tri and Other M
Animal Crossing
3rd party
Muramasa The Demon Blade
A Boy and His Blob
Trauma Center Second Opinion
Sonic and Sega All Stars Racing
Fragile Dreams
Heres a couple of the really good WiiWare games too
Cave Story
Lost Winds