Post links to English-language image boards here. To start off, here are the usual suspects:

http://www.iichan.net/ - DEAD DEAD DEAD
http://www.4chan.org/ - The original English-language board.
http://www.0chan.net/w/ - The Switzerland of image boards.
http://www.5chan.net/ - lol furries

Post more, unless they prefer to stay secret.

http://www.ferricorp.com/public/fchan - Futallaby I put on my site, may as well pimp it here.

http://www.nchan.tk/ - nevada

http://ychan.yosc.net/
http://ryoga.heypoorplayer.org/
http://rksa.no-ip.com:8008/~etherstyle/iboard/imgboard.htm (one big /b/, it seems)
http://mooniidx.bemanistyle.com/imgboard/ (i have no idea)
http://www.phylomortis.com/r/imgboard.htm (pretty cool board for hobby game designers with sprites and shit)
http://ctgameinfo.com/fanart/imageboard.php (as bad as it sounds)
http://board.gundams.net/ (a gundam board - obviously)

http://pichan.anre.org/ (pi-chan - art fags)