Well-seeded torrents on a dedicated tracker:

http://tracker.tx.se/KNOPPIX_V3.4-2004-05-04-DE.torrent
http://tracker.tx.se/KNOPPIX_V3.4-2004-05-04-EN.torrent (first release)
http://tracker.tx.se/KNOPPIX_V3.4-20...4-EN.2.torrent (second release)

See http://tracker.tx.se/ for info.

.-tx