With STEAM, Impulse, Direct 2 Drive, Games for Windows Marketplace, and Gamer's Gate, I have purchased a crap-ton of games on sale from Thanksgiving to now. Note: STEAM's sales will go on until January 2nd. A list of the awesomeness that I was able to purchase for about the price of 2-3 normal games:

Viva Pinata
Blacklight: Tango Down
Penumbra Complete Series
Amnesia The Dark Descent
Command & Conquer 4
Elemental War of Magic
King's Bounty Crossworlds
King's Bounty the Legend
Batman: Arkham Asylum
Battlefield Bad Company 2
Cryostasis
Left 4 Dead 2
Metro 2033
STALKER Call of Pripryat
Torchlight
Tropico 3
The Elder Scrolls IV: Oblivion
Defense Grid: The Awakening
Red Alert 3
Far Cry
Far Cry 2
Bionic Commando

Then add on the three games that I received for Christmas, and I have a backlog that is higher than my desk.

Super Mario Galaxy 2
Call of Duty: Black Ops
Endless Ocean: Blue World