New York

This 3D, Tron-ish iPhone app lets you search for bars/clubs/shops/etc, then zooms over Manhattan and swoops down on exact locations to provide venue info and user reviews. There's also a colorful subway system overlay, plus you can tap on any commercial building for a tenant list, like 205 Canal Street's Golden Bell Watches and Fancy Jewelry, Inc -- though when something's incorporated, you know it's fancy.