I wanted to mention this website to y'all:
http://www.speedtrap.org
It's an excellent resource when you know you will be driving through unfamiliar territory. Just check out all the cities and towns on your route, look at the number of posts (and the level of vitriol expressed in them) and compare it to the relative size of the city or town and you should get a general idea of what sort of "speed trap town" it is.
This website's saved me numerous times, the most prominent one being Atoka, Oklahoma. Now THAT was a pathetic, punk burg!