Here are the Janurary PDF items from DriveThruRPG.
Leverage Roleplaying Game [Margaret Weis Productions] cool example of Cortex+ in action
The Complete Book of Denizens (d20/OGL) [Inner Circle] more new monsters for your d20 games
Kashindan Main Rules [Lupus Games]
Random Encounters Remastered [Purple Duck Games] for Pathfinder, but it looks like it would work for any D&D-like game.
Legacy: Basic Edition [Battlefield Press] Play an immortal. New version of the Legacy game from the 90s.
Mistborn Adventure Game Digital Edition [Crafty Games] based on the novels. From Crafty Games.
To get 20% off the items above just use the code: HotJanuary2012