I usually get one or two job offers a month, but I always get my contacts via one of my web app projects that I built as a sample of my skills. Surprisingly the offers aren't from ignorant recruiters, and are mostly legit offers from decent startup companies.

Of course I am happily employed full time already so I am turning offers down. However, I don't think being contacted is a bad thing. At the very least I am building a list of email addresses of insiders from reputable startups that I can draw from if I ever am on the search for a new job.