Information Appliance Associates, makers of the PocketMac sync software, have released a free Dashboard widget called PocketMac Gas Pump Genie. It lets you find the best gasoline prices in your neighborhood.
PocketMac Gas Pump Genie searches by zip code and looks for the best deal on unleaded or diesel gas prices in your area. The company partnered with GasBuddy.com to use its data in the widget.