Personally I don't think that P2P video from a browser is probably the best utilization of this technology. Someone mentioned that even the top videos on Youtub

Personally I don't think that P2P video from a browser is probably the best utilization of this technology. Someone mentioned that even the top videos on Youtube only have 4-5 concurrent users. That alone generates a lot of difficulty for that approach. I supppose that the distribution of traffic on Youtube will have a rather fat long tail. Also from a user's point of view for this approach to work it would require storing not only one video but many. I don't see the point of using my diskspace and my bandwidth for Youtube. That's different for Joost. They get users to download, install, and share the bandwidth as they have more valuable less fat tail content to offer. What's more if you are watching fullscreen you probably won't mind that Joost is making use of your upstream. However if you interpret P2P in the browser as a potential Web cache, and don't restrict yourself to the video approach there are lots of interesting things one could do. You just have to look out for Power-Law shaped traffic around big chunks of data. Maybe internet radio with high quality streams where you could time-shift streams to make optimal usage of the P2P approach. Or the distribution of software. Once you have several millon users using your applet or whatever, you could become the next akamai. To get there one probably would have to go to those guys where bandwidth really hurts. Thinking of sites like the underdogs.com, shareware distributing sites, web radio, etc ... . If you can make them happy by potentially saving bandwidth, and the users are happier by potentially increasing download speed, you might get those guys to ask user's on their web sites to download your little thingy. I think there is room for a P2P based web cache, probably not in distributing Youtube like videos. Perfecting the P2P part, and being able to aquire a sufficient install base, a lot of opportunities might arise. Go speed up the net ;-).