Interesting. Has there been any success in disguising encrypted BitTorrent traffic as another protocol? I guess it'd have to be a protocol whose packets contain a large amount of random data and a large number of connections with different foreign addresses. Hmmm.
Skype would seem to fit the bill.
That was my best guess too, and Skype is also ubiquitous and would be extremely difficult (popularity wise) to censor. But I doubt video data is truly random -- it probably has some structure to it.
Encrypted video/voice data looks like encrypted Bittorrent data.
Oops, forgot Skype video was encrypted. Duh. In that case it'd do fine.