You know the drill. You can have four games -- Zeno Clash, Zeno Clash 2, Killing Floor and Dwarfs!?! -- for whatever you want. A penny, if you're terrible and mad at the world (or broke). If you pay $6 or more, you can nab the deliciously weird Rock of Ages, as well as, Rising Storm.
I think Rock of Ages is worth the $6. I mean, what did Def Leppard charge for Pyromania? Add in the weird Zeno Clash games and the fun cooperative multiplayer Killing Floor and it's not a bad haul, though I had something different in mind when I read Atlus was doing its first Humble Bundle (just five more releases of Persona 4: Golden, really).