Well opera has a bittorrent client, and can change user agent, so can konqueror, im thinking OperaTor, proxies are not a problem.
The biggest issue is file size, a 200MB live CD with on the fly compression gives about 700MB uncompressed but Firefox and Thunderbird take up a load of space, plus all the security tools, so Im trying to keep it to apps that pack a lot of punch into a small size (like Opera).
and yes it is a photo (was playing with my new Nikon D50) all stuff on my linux partition got wiped.

(thats why I hatched it as well, dont like unmoded pics of me on the net)