It started today! Or yesterday, maybe, depending on where you live. It'll run from December 20 to January 5; the longest Steam sale that I can remember. Anyway, what does everyone plan to buy? Any games that you can't wait to go on sale? Anything you've already bought?
Right now I'm thinking about Mirror's Edge (already own it on 360, but want a PC version), Borderlands GOTY (same as above; not interested in the second at the moment), and a few indie games that have some pretty high base discounts (like They Bleed Pixels and Scoregasm).
The one game I hope to get this time around is Rocksmith, which is kind of like Rockband 3 on pro mode (you use a real guitar [or bass!]). It just came out on Steam about a month or two ago. I'd also like to pick up Sonic Adventure 2 and Generations, ClaDun X2, Fallout: New Vegas, Recettear, Civ V - Gods and Kings, and Dead Rising 2: Off the Record. And whatever else looks interesting. :3