One of the most detailed 3-D mapping apps on the iPhone is UpNext , which lets you click on 3-D buildings and see a list of the businesses and offices inside. Up until now, however, it only covered New York City. A new update adds three new cities: Boston, Washington, D.C., and Austin (just in time for SXSW, of course). The Austin map won't be available until later tonight, where it will appear in the app's city selection screen. UpNext lets you zoom around the city in a very Google Earth-like fashion, search for restaurants, bars, and stores.