Last night I spent hours with Konspire, a new p2p file distribution application that reminds me a lot of the Freedom Controller I attempted to develop 2 years ago. The konpire developers did a good job of using teh webbrowser for UI and borrowed plenty of knowledge from weblogs, expeciallyu the RSS publish and subscribe model. Another good choice imho is not using java. They also released apps for all major OS-es simultaneously.
It's simple to install, configure and use. I've even set up Adam Curry's Test Channel. [link only works if you are running konspire] and have successfully broadcast several large media files.
Although alot of konspire is similar to BitTorrent, I think this system's got legs. The user experience is certainly a lot more satisfying than other p2p apps and networks. Additionally, anonymity and trust are handled very well in konspire imho.
The path I now see is to integrate this with RSSenclosures. My brain is krunching!