Felt the need to mention that 2009 was a pretty good year for Nintendo gamers with a few of my favourites often going under the radar.
Muramasa: The Demon Blade, Excitebots: Trick Racing, Endless Ocean 2/Blue World, A Boy and his Blob, Sin & Punishment: Star Successor, the original release of Tales of Graces and several more on Wii alone.
Mad World, Monster Hunter Tri and Deadly Creatures spring to mind as well.
DS also had Henry Hatsworth and Infinite Space that were great games. As well as Nine Hours, Nine Persons, Nine Doors, and WarioWare DIY that have been unmentioned.