http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?i=33689117&id=275625131
this is a link to the 36 point (Graphic Design) podcast about networking
many of the ideas should still apply. I would take a listen if I were you, but will also attempt a brief summary
As Laru alluded to, much of the time it’s about building a relationship over time, not one that starts with you saying “hey you got any work for me?” but one that grows from a mutual friendship or similar relationship. Involvement in different professional groups and speaking engagements (as Laru has mentioned) can also help. A website, forum, podcast, etc are all forms of networking. maybe I’m not doing a great job here, give the show a listen (it’s free)