Pay what you want ($1 min for keys):
Dragon Age: Origins (Steam, Origin) **
Peggles (Steam, Origin)
Dead Space 2 (Steam, Origin)
Medal of Honor: Allied Assault War Chest (Origin) *
Command and Conquer Generals + Zero Hour (Origin)
Beat the average to get:
Plant Vs Zombies: Garden Warfare (Origin)
Dragon Age 2 (Origin) **
Bejeweled 3 (Steam, Origin)
Mass Effect 2 (Steam, Origin)
more games to be possibly added: ***
Sim City 2000
Wing Commander III
Wing Commander IV
Ultima VII
Note
* Medal of Honor: Allied Assault War Chest includes Medal of Honor: Allied Assault and its two expansions: Spearhead and Breakthrough, Multiplayer unavailable for this title
** You can get Dragon Age Promotional Items Giveaway from BioWare as well. Credits to PlayerOne for the original deal and Curiosity for mentioning it.
*** Credits to Lysander. EA Korea, on facebook, posted a post about Humble Origin Bundle 2 with lists of games that are going to be added (Probably). Link to ozbargain post of list of games + Facebook post by Lysander.
(tips taken from Ozbargain)