Its not specifically Managed DirectX, but its not excluded either(and as I've often pointed out its my blog so I can break the rules when I want). GameDev.net is having a game development competition with some great prizes. The game concept is both simple and humorous.

"Create a game that includes at least two of the four elements: robots, pirates, ninjas, and zombies. You have complete creative freedom over how you want to include these elements"

Full details here. You have till October 31st to write the game.