Here's a nifty tool that combines Google Maps with a database of observed gas prices: Cheap Gas. You select your location and it shows you where all the cheapest gas locations are (here's a hint: far away). It would be really nice if you could type in a location and have it calculate which station is the most efficient to fill up at based on gas price and distance. It would also be nice if you could input start and end points and have it find a cheap station that's on your way....
Another great use of Google Maps is HousingMaps, which scrapes rental listings from craigslist and maps them out for you by price.
(HT: My cube-mate, who probably got them from this thread on Slashdot.)
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