Bruce Schneier may have gotten a speeding ticket lately, beacuase his recent blog entry is all about evading speeing tickets:
This site is run by an
ex-policeman, and feels authoritative. He places a lot of emphasis on
education; installing a fancy radar detector isn't doing to do much for
you unless you know how to use it correctly.
This spray claims to make your license plate invisible to cameras. I have no idea if it works.
One final note: the ex-cop is offering a $5,000 reward for the first person who can point him to a passive laser jammer that works.