One thing to note: there can be a downside to using too many headhunters. If they all send your resume to the same company, the person hiring might get sick of seeing it. I don't know if this is a big problem,but I was warned about it when I was looking for a job a few months back. Incidently I found my job on Monster, I had my resume posted and they contacted me. I don't think it could hurt to have your resume out there.