I have found sites like coursera.org, and I have also heard that M.I.T. offers free online courses as well (though I have yet to have browsed their site for them). I am wondering how these courses work? I see that you get certificates of completion, but do they have any actual meaning? Is it just something extra to tack onto the college resume, or can any of them actually provide you with college credits? Also, how do those that offer these free courses benefit from them? Why offer them completely free? It's one of those things that sounds too good to be true, but I have heard they are legit. If anyone knows more about them and can fill me in, I'd really appreciate it.