Kotaku reports:

U.S. Xbox 360 owners who shell out the 5600 Microsoft Points necessary to net them Splosion Man, Marvel Vs. Capcom 2, Turtles in Time Re-shelled, Trials HD, and Shadow Complex between now and August 31 will get an extra 800 Microsoft points added to their account, basically cancelling out the price of Splosion Man.

Microsoft is making its push to convert Xbox consumers into regular DLC patrons even stronger with this promotion, which we ve never seen before.

This amounts to gamers spending $80 for virtual goods getting $10 back for their trouble.  Anything to get consumers accustomed to a new distribution method, huh?