What internet programs do you use, and why?

[Aiken]

Win box (work):
Browser - Opera (long time zealot - since v.5).
Mail - The Bat (great filtering capabilities, virtual boxes, etc).
IM - QIP (small, not a bloated one, just works).
IRC - KVirc (functional and handy irc client, and free).
Downloader - Download Master (http/ftp) & µTorrent (best free programs in their class, imo).

Lin box (home):
Browser - Opera (see above).
Mail - Claws Mail (best mail 4 gtk+ env, besides Evolution and Tbird, which I don't like).
IM - Pidgin (best im 4 gtk+ env).
IRC - Xchat (guess what?, eah, same as above).
Downloader - D4X (http/ftp) & Deluge (torrent). (no real gtk+ alternatives).