Completed torrents.
If the torrent has multiple files, one way you can seed the torrent without appearing to be a seeder is to stop the completed torrent, move one of the files elsewhere, tell the Bittorrent client not to download the file, and seed the remains. You won't look like a seeder this way. Just remember to change the missing file every so often so that the missing file gets seeded too.

EDIT: 'night beckx
( mistaspakkaman and the inedible shifting caterpillars, Fri 4 Jul 2008, 1:22, Reply)