I'll only list the PC games from my favourite genre I bought this year after a ~8 year break from PC gaming:
A Vampyre Story
Ankh
Ankh: Battle of the Gods
Ankh: Heart of Osiris
Ceville
Edna & Harvey: The Breakout
Everlight of Magic & Power
Goin' Downtown
Jack Keane
King's Quest Collection
Machinarium
Mata Hari
Murder in the Abbey
Nikopol: Secrets of the Immortals
Runaway: A Road Adventure
Runaway: The Dream of the Turtle
Runaway: A Twist of Fate
Sam & Max: Season One
Sam & Max: Season Two
Space Quest Collection
Tales of Monkey Island Chapter 1-5
The Book of Unwritten Tales
The Immortals of Terra: A Perry Rhodan Adventure
The Longest Journey
The Secret of Monkey Island: Special Edition
The Whispered World
Treasure Island
I bought 30+ more games this year for PC/PS3/PSN/Wii/WiiWare/DS/PSP (and got 4 PC games from my Steam Secret Santa).
Ridiculous.
2009 is over in 5 minutes and I just skipped my initial New Year's resolution.
My new plan for 2010 is to play all games I bought in 2009 and to buy not more than 10 new games across all platforms within the next year.
Happy New Year everyone! 
Essay Pro