Ah Managed DirectX, well XNA is more of what MDX2.0 was going to be, but that was absorbed into XNA to create a single great product rather than 2 okaay products. I guess the MDX engine would be dead because Mike at the very least has moved onto its successor XNA, so why not move on as well. Remember that if you are fine with sacrificing Xbox360 capability, you can use XNA just like you did MDX, creating the device yourself etc.

But otherwise I think most of us have moved on to XNA.