Network to a job through Linked In

I’m still on this networking kick. I signed up for a score of groups on Linked-In because the “buzz” on the street is that Linked-In is the place to find a job. There have been a multitude of jobs listed for medical device specialists. That’s me! I have applied for this position so many times that the recruiter, Darren, in England pretty much told me that he would call me if something came available. He does not return my calls and does not return my e-mail requests. I want to scream to the world…THAT’S ME! I DO THAT! I am your medical device gal. I sent him an e-mail telling him we are willing to relocate, that my husband was a British citizen so sponsorship was not an issue, I tried to summarize my various unique equipment experiences, but ‘ole Darren just isn’t buying into me. So I have to ask the question, “does he really have a job available or is he just collecting resumes?” I don’t know. I always fancied myself a fine writer but now I question my cover letter techniques. My resume certainly isn’t cutting the mustard. I need to repackage myself. What about your resume? Are you getting enough responses from your efforts?