The Microsoft Developer Network has a show on Managed DirectX.
DirectX has been providing game developers with a great platform for rich and fast-paced games on Windows for many years. As our platform technologies advance to embrace the concepts of "Managed" programming, DirectX rises to meet the challenge head on. With DirectX 9, we see the first release of the Managed API for developing DirectX-based programs and games.
The episode talks about what managed DirectX bring to the graphics programming arena.