What It Is: While Starbucks and universities are well-known public Wi-Fi hot spots, travelers and workers on the go might not always know where to find a reliable signal on the road. Some products help parked drivers harness the Internet in the car via a wireless router in the trunk or on the backseat. Other products act like Wi-Fi-divining rods and light up when a hot spot is near.

How to Get It: Autonet Mobile's router fits under a seat, in a glove box or in the trunk, comes with encryption technology and, because Autonet also is an Internet-service provider, you can surf the Web with the flip of a switch. The company says the service is reliable even in rural areas. EVDO-coverage.com's mobile wireless router, which fits in the trunk or on a backseat, can disguise its signal so that uninvited Internet users won't know it is there. Both Targus's Wi-Fi Scout and Cardcam's Wi-Fi Finder Plus clip to a keychain or a laptop case.

Full article continued at The Wall Street Journal: Reinventing the Wheel.