Now I have created a first version of a .NET wrapper for the XPS LightFX SDK from Dell. And it does work a lot better than the C++ sample Delll shipped with the SDK. I don't know if Dell offers any way to contribute to their source code. If they do I have made their C++ sample more robust too. :)
The code includes a simple sample, but you do need a XPS M1710 or XPS M170.
I have only tested with XPS M1710 on XP, please report any problems. This version only supports one of the two ways to control the LEDs, the sequence read from XML file. Not the direct control. But hopefully I will find some time to implement the rest also. But otherwise you are welcome to help.
Here you have my XPSLeds Download, have fun!