I thought 2009 was one of the best years so far, at least for third party titles. We're finally starting to see a decent effort by third parties. Titles like F1 2009, Modern Warfare Reflex, and Shaun White World Stage are all simply fantastic. Avater: The Game (Wii version, which is different then the others) looks great, and even The Conduit, though it was a little rough around the edges, showed some serious promise. And lets not forget about the introduction of motion plus with games like Tiger Woods 10. Add first party titles like NSMB Wii, Metroid Prime Trilogy, and Punch Out, and it was definitely a solid year -- much better than 2008.
Having said that, 2010 looks even better from both a first party and a third party perspective.
The Crystal Bearers
Monster Hunter Tri
Dynamic Slash (Please!!!!)
Red Steel 2
Metroid: Other M
And I'm sure there are many more.