Do me a favor, go and look at a site called "Papermasters"--the link's precisely what you think it is, but I don't want to give them any publicity just yet.
I can't see the site itself from here, but its description strikes me as very, very suspicious: "Paper Masters creates custom research papers, term papers, essays, theses, and book reports. Get plagiarism free masters thesis proposals and term papers written by native English speakers." That sounds an awful lot like offers to write reseach papers, and correct me if I'm wrong, but I'm pretty sure that having someone else write a paper for you counts as plagarism even if the writer didn't copy anything at all. It's turning in someone else's work as your own, either way.
I have to say, I'm very tempted to sign up to do some writing for these people, and in every paper include a phrase, buried in the middle of a paragraph, that says something to the effect of "Dear professor, you should know that your student didn't write this paper; he or she paid1 a website called papermasters for it." At the very least it would teach them to be careful cheaters.
1: Wow. I just had a total brainfart that caused me to want to spell that word "payed". WTF?