I spent a good deal of time comparing the various guidebooks to Berlin, and the Rough Guide emerged as easily the best available. Extensive, well-written background information, comprehensive sightseeing listings and an invaluble tube map. The restaurant recommendations were spot on (and extensive, too), and many of the suggested activities and excursions take you beyond the standard tourist circuit. The street maps were less impressive, though excellent maps at tube and S-Bahn stations meant this wasn't too big a problem. My main quibble, however, is that some of the listings are out of date - a good four or five recommended shops no longer exist or have changed entirely in nature, and it was frustrating to repeatedly come up against this. A great guide, but hopefully a new edition's in the pipeline.