Want the Web wherever, whenever? The same wireless networking that is invading homes and offices is now going public, with thousands of so-called hot spots throughout the United States. All you need is a notebook or other device with Wi-Fi, and you can get high-speed access at cafes, airports, and hotels. Whether you subscribe to a commercial service such as Boingo or T-Mobile HotSpot or go it alone with a community connection, chances are there's a hot spot right around the corner. For a list of nearby hot spots, just enter your zip code and click Go. Or if you have something more specific in mind, you can fill out any of the power search options.