You can't actually buy gas online, but Web resources can help you find the cheapest fill-up in town. Among them, GasPriceWatch.com and Gaswatch.info help people track pump prices. More comprehensive is GasBuddy.com, which includes a network of 174 local sites, complete with maps and message boards that tally gas price by ZIP code. "People are frustrated by the variation in the price of gas," says GasBuddy.com co-founder Jason Toews, and they're using the Internet to take control.
