Hey bud. Just read your post. If you have been sending your resume for that long I have some advice that I heard "through the grapevine" Type up a new cover letter/ e-mail body letter. (Cover is not required). Open a new free e-mail address, (gmail/aol), and try sending your new e-mail from this new address. I have heared from someone in HR at a different company that they put e-mail addreses on a ban list after they look at it once and decide not to call you then... to make screening easier if you have 10.000 resumes and people also updating regularly.
Hope this helps and you get the call!