The Humble Bundle 3 now includes a bonus game titled Steel Storm: Burning Retribution, which can be downloaded at no cost if you've already purchased this bundle.
"Humble Indie Bundle 3 just got a little better with Steel Storm: Burning Retribution!
If you've already bought Humble Indie Bundle 3, just go to your download page and it will show up next to your other five games.
If you haven't picked up your bundle yet, be sure to pay what you'd like for a bundle of five awesome DRM-free games on Mac, Windows, and Linux: Crayon Physics Deluxe, Hammerfight, VVVVVV, And Yet It Moves, and Cogs."
More info at: http://www.humblebundle.com/