I still cannot find in English-speaking net something similiar to http://www.intuit.ru/, except livemocha, but the last is only about linguistic. I mean full-functioning online university for self-education, for free or for little money, I think they have to be, because English Internet is much wider, but I still do not know any. MIT courses are great, but they have not tests in them, so this is not actually an online university, this is a bunch of published learnbooks.