I use the 2 or 3 different gas stations that are on my usual route. I don't like driving out of my way to get the lowest priced gas since, even in my hybrid, I figure that extra driving probably cancels out some if not all of my per gallon savings.
I'm with you, though, I love that website and check it when I'm going to be traveling somewhere to get a sense for what a "good" rate for the gas there will be (so I can avoid the worst price-gouging stations right off the highway, for example, on a road trip.)