Would it may be good to have a short tutorial on how to do that? It is a very simple task to add a shadowmap, wich means that I could try to write something wich is may even a bit usefull

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com