Surfing
Internet cafes are becoming more and more common. You can expect to pay €1-5 euros per 30mins. High speed connection is more common in the bigger internet cafes. Here are some website you may find useful during your stay:
www.db.de
www.bvg.de
www.berlin-tourist-information.de
www.berlin.de
www.insidertour.com
These places can get you connected:
Easy Everything Kurfurstendamm 224
Hellnet Hellersdorf Ernst Bloch Strasse 39
Hellnet Neukolln Karl Marz Strasse 66
Netlounge Auguststrasse 8