This Wednesday's XBLA update is a long-awaited port of a PC favorite, Darwinia+. The game was retooled for the 360 to try and fit the RTS gameplay with the 360 controller. Definitely trying the demo out when I get a chance, though the 1200 MS Point purchase will probably have to wait for a while.
Also this week is a discount on three other games normally priced at 1200 MS Points. Invincible Tiger, Marvel vs Capcom 2, and TMNT Turtles in Time Reshelled are all 800 MS Points until the end of the week. I personally didn't care for the TMNT remake and MVC2 - though a great game - isn't my cup of tea. Invincible Tiger, however, looks interesting and may make it into a future review.