OnBeyondBeing asks: "A few of my friends and I are taking a class at a local university called 'Internet and Society' and we have to do a 'Technology Tour' on innovations that have social aspects or uses (like Google Maps, Kiko (an Internet-based calendar), LiveJournal and Frappr). We chose to do our presentation on BitTorrent. As part of our presentation, we have to do a lab in which the students and teachers use BitTorrent in some way. I was thinking of having people join some BitTorrent community that interests them and join a torrent, but most of these communities contain material that is not suited for an academic presentation. Aside from places like CommonBits and Etree (and others that were mentioned in a previous Slashdot post), what sites have you found that use BitTorrent as the basis of a community that are clean and legal enough for a class presentation? Alternatively, what other interesting, legal uses of BitTorrent have you found?"