If you're a premium member of the XNA's Creator's Club, you now have access to Garage Game's Torque X and Torque X Builder for free! Previously, this cost $100!
What is Torque X? It is c# based game engine that allows 2D drag and drop game creation! It allows you to make use of physics and shaders effects to create a game quickly instead of from the ground up.
P.S. -- When visiting the XNA Creators Club Online website, you MUST use the same passport account that's associated with the gamertag that has the XNA Creators Club subscription, otherwise you won't be able to download the software.
Via Let's Kill Dave