Found at Eurocheapo: http://www.eurocheapo.com/blog/berlin-mone...elcomecard.html
Two passes in particular, the Schaulust Museen Berlin pass and Berlin’s Tourism Board’s Welcomecard offer particularly good deals for quick trips. Take a look.
With the 3-day Schaulust-Museen Berlin pass, travelers have access to about 70 Berlin museums and collections, for free! You must use the ticket for three consecutive days. The museums pass is not valid for some special exhibitions, so check with the tourism board, or via their web site, for more details. Cost: €19 (€9.50 for students with valid identification).
What museums can you visit?
Highlights of the pass include the Staatliche Museen zu Berlin, the Preussischer Kulturbesitz (including the Bode Museum), the incredible Pergamon Museum, Egyptian Museum and Gemaldegalerie (painting gallery).
In addition, you can hit up Stiftung Stadtmuseum Berlin, the German Technology Museum, and the Brücke Museum. The 3-day “Museumspass” is available online and at the Berlin infostores.
Another terrific option is the Berlin Welcomecard. It’s a great value offering free public transportation, a pocket map, and 50 percent off admission to more than 140 museums and city sights.
This year, to help mark the 20th anniversary of the fall of the Berlin Wall, the Berlin Tourism Board launches a new 5-day Welcomecard (it’s previously only been available in 2-day and 3-day versions).
Cost: The pass is €16.50 for a 48-hour period, and €22 for a 72-hour period. The new 5-day card costs €29.50. Also new this year, a special card that tacks on free shuttle service to and from Tegel or Schonefeld airport. Prices vary, so check the site for details.What else is cheap in Berlin?