Have you been to a trade association event lately? Suddenly heard from an old college buddy? With so many people between jobs these days, it's no surprise that everyone seems to be brushing up on their networking skills. The economy may not be booming, but the network certainly is. Friends who didn't return telephone calls a year ago are suddenly easier to get ahold of. After having been started-up then shut down, dot-commed (or dot-conned), un-vested, repositioned, downsized, made redundant, or laid flat by layoffs, it's no wonder people are "doing lunch" again. Even if you still love your old job, you're probably a little more visible these days. Here's a list of do's and don'ts to help you maneuver the art and science of professional networking.