I'm seeding a torrent, and cannot achieve a reasonable upload speed. My download is find, but I average about 2-3kb/s upload. My ports are forwarded correctly and there are plenty of leechers.

My version is "KTorrent 2.1 (Using KDE 3.5.2)"

I notice my problem is almost identical to this unsolved post:
http://ktorrent.org/forum/viewtopic.php?t=1363

I notice that absolutely every leacher is marked as "Choked". Why would this be? I've set my upload limit to "0" and have plenty of upload slots.

Choked means that a peer has choked you.

Anyway, I would upgrade to 2.1.3, so you have the latest.