I kept my spending in check, because I just bought a wah pedal (535Q if you know that stuff)
GOG: Haegemonia
Steam: C&C3 and Kane's Wrath
Impulse: GalCiv II

Gog- Nothing. I got my dates confused and I thought the sale was gonna be going on till late last night. I went to take advantage yesterday, and the sale was gone. :(

I was planning on buying sanitarium, fallout tactics and maybe some duke nukems.
Steam: luxor 3 for $1
lumines pack for $2
torchlight for $10
outrun 2006 for $2.50
Stalker for $2 ( I think)
Star Wars Jedi Knight 2 for $5

I bought Empire Earth at the beginning of December, just missing the sale. I bought the list below from GOG during the holiday sales. I don't buy from Steam.
Advent Rising
Far Cry®
Freespace 2
Heroes of Might and Magic® 3: Complete Edition
Panzer Elite Special Edition
Silent Hunter® 2
Spellforce Platinum
Stronghold
Stronghold Crusader
Tom Clancy's Ghost Recon®