This is very true. I knew someone who couldn't get a job with another advertising firm because he had signed a non-compete. Even though they're not enforceable,

This is very true. I knew someone who couldn't get a job with another advertising firm because he had signed a non-compete. Even though they're not enforceable, no company wants to hired from another company where they know those companies sign non-competes (and hence they could be in for a court case). This situation is real and I've seen it happen more than once.