Where's the Cheapest Gas?

With the current gas prices, it feels like I'm having to find more ways to save money just to put gas in my tank. I ran across a site today, GasBuddy.com, that shows the lowest gas prices for the US and Canada. You can search by zip code or city and state, or use the map. The prices are broken down into Regular, Midgrade, Premium, and Diesel, and are shown for the latest 36 hours.

You can also sign up for free to become a gas price spotter, reporting gas prices in your area to help others. Membership also makes you eligible for prizes such as a $250 gas card.