Signalmap is a neat webapp that lets you punch in your zip code and your cellphone provider and see how the reception is where you live. Not only can you use it to gauge where the best place is to make your call, you can compare the four big providers so you can see which one is best suited for you (based on your home and work location). Of course, the signals are all user-contributed, so there's no guarantee that providers themselves haven't gone and flooded the site with slightly higher than usual signal ratings. [Signalmap]
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This is fantastic. When I look for a new place to live, I could use this to find areas where all the cell phone signals are dead, and then maybe there will be less of a chance of traffic accidents from idiots talking on cell phones while driving.