I often purchase the Humble Bundles to support indie developers. These bundles usually contain Steam keys as well as DRM-free versions of the game. Since I have collected a lot of games now, I’m also collecting duplicate Steam keys. Humble Store recently added the option to gift duplicate Steam keys to someone else.
If there is interest, I will use this topic to list games that I have spare Steam keys for. If you want a game, just ask, and I will gift it to you (no catch). First come, first serve.
Spare Steam keys so far:
Space Pirates and Zombies
Jamestown
Closure
Shatter
Dungeon Defenders