The original archlinux-2009.02-ftp-i686.img USB image was broken, a new image (archlinux-2009.02-2-ftp-i686.img) has been uploaded. We are sorry for any inconvenience this may have caused you.
With one image broken, we also had to create new torrents: We now use a single torrent per file again and added more mirrors to the webseeds. All seeders should stop seeding the old torrent and get the new ones.