Starting now, you can download Monday Night Combat from Steam for free and play until 1PM on Sunday, March 20th. You'll enjoy the full game, including all of the dlc, for the low low price of zero. If you decide you want to keep the game, it's on sale for 33% off the normal price - making it only $9.99. And if you're feeling generous you can pick up a four pack of the game to play the four player co-op Blitz mode for only $29.99.
You can read our review of the XBLA version Monday Night Combat right here. The PC version is a more refined and tigther experienced with quite a few more pieces of content added out of the box for free.