It's going to be be brutal, always great deals. Watch your wallets and DO NOT BUY A GAME UNLESS IT's PART OF THE DAILY DEAL.
http://slickdeals.net/f/3733274-Steam-Holiday-Sale
Check here for all the details:Day 1
Bunch of Heroes - $2.49
Singularity - $7.49
Sam and Max - 75% off series
Fable III $12.49
Just Cause 2 (DLC is also discounted) - $4.99
Rift - $7.49
Metro 2033 - $4.99
Max Payne - 75% off
Portal - 66% off
Orcs Must Die - $3.74
Amnesia - $4.99
http://slickdeals.net/f/3733274-Steam-Holiday-Sale