The latest Humble Bundle, The Humble Jumbo Bundle, offers three games for whatever price you want to pay, and six games if you pay more than the average price. These games include Natural Selection 2, Sanctum 2, and Magika plus all the DLC.
Paying more than the average price will get you three more games - Orcs Must Die! 2: Complete Pack, Garry's Mod, and Serious Sam 3: BFE. While bundle does require you to have a Steam account, at least they are available for Windows, Mac, and Linux.
The bundle has already raked in $200,000 from the sale of over 52,000 bundles. Charities being supported this time around include Child's Play and Watsi. You can find out more about the latest Humble Bundle by watching the video to your left or visiting www.humblebundle.com