bittorrents are distributed via http. perhaps what you mean to say is: corp's don't allow exchanges over anything other than ports 80 (http) and maybe 21 (ftp).

Corporate networks don't allow the additional software. HTTP is likely limited to ports 80, 8000, and 8080, and only the standard browser can authenticate itself to the application proxy that lets you get to the outside world.

Sorry, but standard browsers on port 80 is pretty much your audience. If you can apply CSS+RSS in that model, then that will be ok.