@W3bbo: I'm using the official Kinect SDK. The RGB video is exposed as a bunch of PlanarImage objects for each frame, that you can poll or subscribe to an event that returns one as soon as it's ready. The PlanarImage isn't specific to any framework, but you can get to the bits and other data easily and convert it to whatever image format you need. It's not entirely convenient, but an extension method is easily written and it's still pretty versatile this way.
Did you use the Coding4Fun libraries? I think I remember seeing some extension methods to simplify some of that stuff being demonstrated in Dan Fernandez's videos.