Pretty damn fucking cool if you ask me!
Just put in your zip code (US only)
Every night MSN Autos receives pricing data from over 90,000 gas stations across the nation. Please note that gas prices in your area may change more frequently than we can obtain them.*
http://autos.msn.com/everyday/GasStations.aspx?m=1
*MSN Autos strives to bring you the most up-to-date gas prices possible. However, we do not receive prices every day from every station. Our partner, OPIS, obtains pricing data from participating credit card transactions, direct feeds from participating retail chains, and other survey methods. Please note that during times of extreme price volatility, these collection methods may trail the latest prices at some stations.