I found this Magma Bookshop while walking around..it was very nice..some designer's toys, a lot of art book, pins and t-shirts...you can find also magazines like Juxtapoz..
don't miss the Tacheless/Cafè Zapata for easy alternative night life in Mitte..
for hard-core club scene, try to enter at the Berghain/Panorama not earlier then 4am, door selection is really strict and you can do nothing..if they like you, you're in. Not for the faint-hearted.
