LTL;FTP and all that.
Anyway, I am in the process of creating a map of the outdoor spots in Berlin. This map is by no means a definitve map of the spots and it will be updated over time once I discover new spots to ride. (If anybody from Berlin has a few tips, let me know, I will add them.
The map can be found here: Outdoor Fingerboard Spots Berlin
So, should you ever visit Berlin to pay the Asi Berlin Store a visit, you can also check out these spots.