Pay $6 or more and you also get DiRT Showdown and DiRT 3, along with Overlord II. It should be noted that Codemasters is working to remove GFWL from DiRT 3.
"This week, the Humble Weekly Sale features seven action-packed titles from award-winning games developer and publisher, Codemasters," reads .
"Pay what you want for the warped fantasy action-adventure game, Overlord and Overlord: Raising Hell DLC, the military conflict simulators, Operation Flashpoint: Red River and Operation Flashpoint: Dragon Rising, and ancient Greece-based action RPG, Rise of the Argonauts. Pay $6 or more and you'll also receive two all-action racing games, DiRT Showdown and DiRT 3, as well as the sequel to the dark fantasy game, Overlord II."
Check out this week'sfrom Codemasters. A $1 minimum is needed for Steam keys.