There's an interesting medley of titles in the latest Humble Weekly Sale. Rising Storm is the standout game (you have to pay around £4 to unlock it though), and makes picking up the bundle worth it all by itself. Added to Tripwire's visceral WWII shooter are other titles including Killing Floor, co-op brawlers Zeno Clash and Zeno Clash II, and Rock of Ages. As always you can pay what you want, with a slice of the proceeds going to charity.