Finding the cheapest gas will save you money in the long run if you don't have to drive too far to get it or else you've wasted gas finding cheap gas... Duh!
So the trick here is to find the gas station of the day in the area that you travel regularly so as not to have to go out of the way to get it.
The cheapest gas stations are listed on a daily basis on a few sites.
I like the Gas Buddy site.
This is a network of people reporting in to the Gas buddy site about prices that they have seen.
Another good one is MSN Auto.
Every night MSN Autos receives pricing data from over 90,000 gas stations across the nation.
I have several favorite map sites from Google and other companies.
An interesting one is Map Quest. They have a map - lowest priced gas station function that is cool.
There is another web site reporting cheap gas... Gas Price Watch.
This one has similar functionalities to the MapQuest Gas station site
The Internet Auto Guide is a site I visited and found to be a bit cumbersome but definitely useful as it found a cheap gas station in my neighborhood.
We are all concerned about this gas crisis, so here are some very useful pages with relevant information to help you in the world's newfound quest or the best gas prices.
Save Money On Gas <---Highly recommended page