www.berlin.de
official berlin website with info on sightseeing, events, hotels, restaurants, theatre, shopping, and much more.

www.stadtplandienst.de
online map of berlin and other german cities.

bvg.de
public transport (u-bahn/underground, s-bahn, bus, tram, ferry).

berlin-hidden-places.de
describes hidden places of art, architecture and natural beauty; names special culinary delights, places to stay overnight, and introduces unusual places to shop, public events and upbeat meeting places.

www.zitty.de
online edition of berlin entertainment and events guide

www.berlinista.com
online magazine for electronic music, fashion & style berlin