Better networking through professional associations
Chris Russell has a great tip on Secrets of the Job Hunt: "If you want to open up opportunities for yourself and your career, consider joining a professional association." He has some specific ideas of how associations can be useful in the job search, plus links to directories of associations.
When you're out of work, it's too easy to network with other people who are looking for work. You need to make connections with people who are working, and associations can be a great place to make those connections.