Mixwit is not some whizzed up version of Mxit, but rather a totally free site which allows you to create, customise and share your own playlists. It's fully integrated with Vuisboek and oodles of other social media hang-out zones so you can publish and share your playlists as widely or as selectively as you choose. It also places convenient "purchase this MP3" links (to iTunes and to Amazon) on each song you playlist, should someone like the track enough to wish to Do The Right Thing and transact financially instead of merely rip.
It's pretty intuitive to use, though there is a link to a tutorial (also availble in Espanol) and you can generate playlists as fast as your imagination allows. I've managed a mere three - in various stages - thus far, and have yet to get funky with designing my own skinz or anything too daring. Because... well, there seems to be some bug (it's still in beta) that's not entirely iBook friendly, and so the drag and drop interface to populate the playlist doesn't recognise my touchpad. And, once I connected a mouse, that was fine... for the rest of that playlist. On the next one, it went on strike again. Oh well, I may have to borrow a PC to finish them, if the bug doesn't sort itself soon.
It also allows you to search for other mixes: by user, by artist, by track title, or by mix title, and allows you to favourite mixes or fan their creators - the social media side of it, which stops it being yet another soapbox for the Warhol generation.
Because it allows you to playlist anything in MP3 format anywhere on the interweb, the potential educational possibilities are also numerous, but why let serious educational potential undermine a little fun, huh?