Both Battlestar Gallactica and Exit are available for download via Xbox LIVE Arcade. Both will set you back 800 Microsoft Points for the full version. Battlestar Gallactica supports up to 8 people for multiplayer (in addition to it's single player mode), while Exit is more of an addictive single player game.
Major Nelson just updated his blog with the message that both Battlestar Galactica and Exit will be released this coming Wednesday on Xbox Live Arcade. Both titles will cost 800 Microsoft Points each. Battlestar Galactica has been developed from scratch by Sierra for Xbox 360 and PC. Exit was previously released on PSP, and in a better form on Xbox Live Arcade as of Wednesday.
The latest Famitsu issue reveals that Taito Corporation plans on bringing its PSP puzzle game Exit to Xbox Live Arcade. In Exit you assume the role of Mr. Esc, a masked individual tasked with rescuing people from buildings under a time limit, avoiding various traps and solving puzzles.