The only thing more frustrating than not being able to find a guidebook for your destination is discovering, once you get there, that the one you do have is hopelessly out of date.
Thanks to Schmap.com, that might never happen again. Its free, downloadable, digital travel guides are updated constantly, and each one features photos and reviews for hundreds of hotels, restaurants, theaters, museums, and other sights and attractions, as well as links to local online content, transportation, weather, events, and activities.