I tried out the 0.8 preview release of BlogTorrent today. Pretty interesting, but I couldn't get it to work. Maybe it works better on the uninitiated, but I found myself confused and fighting with their upload tool and trying to figure out if it wanted torrent files from me or if it was going to make them itself and then how to get that over into seeding the files. I assume there'll be better documentation eventually or I'm just a dummy. I had a lot more success with Ryan's WPBT Bittorrent tracker for WordPress. Easy to install and it integrates into the Wordpress user system. It worked first try for me, though you have to use other utilities to make your .torrents and seed them. It doesn't make Bittorrent seeding a point and click experience, but it made it a hell of a lot easier, which is good enough for me.