If you have MechAssault 2: Lone Wolf
for your Xbox and an Xbox Live subscription, you can get two new maps for the game. Here's the blurb:
This round of free content consists of two maps that were originally featured in the Limited Edition; each playable via System Link, split-screen and Xbox Live. The first map, Mountain High, supports five game types: Team Destruction, Check It, Snatch it, Base War and Grinder. The second map, Troubled Waters, is playable in multiplayer Destruction mode and can also be played by either one or two gamers in the offline Grinder mode.