I was browsing Andy "ZMan" Dunn's website, The ZBuffer, this evening and came across some interesting new tidbits.  I continue to be amazed at that people are doing in C# with Managed DirectX.  Case in point: HADDD.  These guys have created an amazing free 3D engine for first-person shooter games.  They've created two demo videos (XVid codec required) which are well worth downloading.  The first video does a great job of creating a "teaser" trailer for a game....dark lighting, mood music, things that go bump in the night.  Turn off all the lights and watch it with the volume turned up.  Creepy.  Written in C# (Using the latest C# Express beta no less!) and Managed DirectX.  Enjoy!! 

P.S. -- Brush up on your Spanish if you intend to read the forums or the source comments.