Octoshape is an interesting P2P video plugin with Linux support, also used by CNN and other companies. At the moment it is still just an executable file which needs a script in order to run, so the support for Ubuntu has yet to be implemented. If you want to try it out, give it a bash and see how it flys. Then figure out a way to package it properly. I know it is something I could do, when I get round to reading the debian packaging manual.
Unfortunately the plugin is not GPL’d — there is a fairly lenient EULA which gives users a non-exclusive license for private use, and since this also entails interacting with other computers and users in order to create a P2P network, I don’t see how the license is actually enforcable. Give it a read, before you do anything rash like releasing it via a ppa, since you might have to ask the company for permission.
A simple mozilla plugin would help viewers deprived of bandwidth and living in the third world. Yes, P2P is a way out of the censorship model.