If you want to jump straight to the new 2K Humble Bundle, here's the link. It's a tremendous value.
This one is offering pay-what-you-want pricing for The Darkness II, The Bureau: XCOM Declassified, and the original BioShock. Pay more than the average, about $5.45, to also get Mafia II, Spec Ops: The Line, and BioShock 2 -- with "more games to come soon."
And finally, you can pay $20 to unlock BioShock Infinite and XCOM: Enemy Unknown. The bundle will be available until Tuesday, July 22 at 11:00am Pacific. Highly recommended.