Thank you frazzle
I have to play around with the parameters a bit more or maybe use a fourth depthmap...

I just got the problem fixed that the shadows were one frame to late. Here is a new clip: http://www.youtube.com/watch?v=CtBjXkKmYUw

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

http://www.slindev.com