I'm getting ahead of myself here as I'm just getting into editorial work, but how would one progress from editorial into commercial?
Commercial is where I've always wanted to be at. My friends have asked why I'm not more open to the idea of shooting weddings and regular portrait work. It's just not something I'm interested in making a carreer out of. I want to do commercial.
So, how do you break into that line of work? Say I have a solid portfolio, publishing credits, and a good bit of experience doing what I'm doing, how do I find out what companies need photographers to shoot advertising work for them or what companies to solicit to? I could send out 500 cold calls to 500 companies that aren't currently looking for a photographer and maybe get 5-10 people that like my work, but ultimately have no use for me. Is there something like a help wanted board for companies looking for photographers to do this type of work for them?

