Street skate spots in Berlin?

Hi, we are some skaters from Oslo, Norway, who all want to go to Berlin this easter for skating. Some of us have been to Berlin before, but none of us has seen too many good street spots. Can someone here please tell us some good places to go? Addresses would be great, so we can locate the spots on google maps! Thanks!

http://www.tacky.no/skateboard/video/?id=132884

There are so many spots in Berlin... The most popular ones are:

Kulturforum, and Opera at Potsdamer Platz

monument at Friedrichshein

and ledges at Warschauer Strasse (near S-bahn)

You can also check Skatehalle - skatehalle-berlin.de also near Warschauer Strasse.

At any of this spots you can ask for direction to go to ather spots, or the best way is to find someone who will show you around. To be hones I had a guide and just can't find on map most of the spots we were at.