You've got between now and January 4th to get in on the Steam Sale. Disregard Christmas, acquire games.
Go go go go!
Don't forget, daily and flash deals are a thing of the past, so there's no more waiting for the perfect moment; just get it or don't. If you're wondering why, you can most likely thank the refund system. With refunds in place, people would be able to return a sale item they already bought if they caught it at a lower price later, and that's just bad for business.