City Guide Berlin
- Personal guided tours in Berlin and Potsdam in a variety of languages, by bike, steamer, waterairplane, balloon.
- http://www.cityguideberlin.com/

Lonely Planet World Guide: Berlin
- Short geographical overview, information on events, attractions, history and modes of travel to and within Berlin.
- http://www.lonelyplanet.com/worldguide/destinations/europe/germany/berlin/

Berlin Travel
- Collection of hotel, excursions, concert and Fredric the Great information and booking opportunities.
- http://www.berlin-travel.info/

Berlin Tourist Information
- Official tourist information site with online reservation and event details.
- http://www.berlin-tourist-information.com