I'm a Salesforce.com developer and am constantly getting hit by recruiter spam. In the last week I have gotten 15 requests, only 5 of which are in my area. The rest? Over 500 miles away at the very least!
Whenever you are working with a popular technology set, you are going to get hit up by non stop recruiters. The part that drives me nuts is the non intelligent ways that they shotgun blast. In my current position (I work for a major non IT recruiting company), I'm working with a Salesforce based recruitment engine. I KNOW what options are available to many of these systems. It seems like they do not utilize any intelligence beyond a keyword search. In the engine that I've aided in developing, we have many different options available to better target appropriate candidates. For example, something simple, like a zip code radius! Heck we even incorporate state based filters if you don't have zip codes.
Unfortunately, there is not much that I can think of to combat this other than unsubscribe. The only issue there is you might later miss out on a legitimate job opportunities. I mean heck even terrorists manage to get lucky at times in action movies, and these folks might get one in 200 right