In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org
The following mirrors should have dvd .iso images available for download:
Nearby Countries -
http://centos.candishosting.com.cn/5.5/isos/i386/
The following mirrors should have the cd .iso images available:
Actual Country -
http://ftp.riken.jp/Linux/centos/5.5/isos/i386/
http://ftp.iij.ad.jp/pub/linux/centos/5.5/isos/i386/
http://ftp.tsukuba.wide.ad.jp/Linux/centos/5.5/isos/i386/
http://www.ftp.ne.jp/Linux/packages/CentOS/5.5/isos/i386/
http://ftp.yz.yamagata-u.ac.jp/pub/linux/centos/5.5/isos/i386/
http://ftp.nara.wide.ad.jp/pub/Linux/centos/5.5/isos/i386/
http://ftp.jaist.ac.jp/pub/Linux/CentOS/5.5/isos/i386/
http://rsync.atworks.co.jp/centos/5.5/isos/i386/
Nearby Countries -
http://mirror.averse.net/centos/5.5/isos/i386/
http://mirror.usonyx.net/Linux/CentOS/5.5/isos/i386/
http://centos.ustc.edu.cn/centos/5.5/isos/i386/
http://mirrors.163.com/centos/5.5/isos/i386/
http://centos.tt.co.kr/5.5/isos/i386/
http://ftp.daum.net/centos/5.5/isos/i386/
http://centos.mirror.cdnetworks.com/5.5/isos/i386/
http://mirror.khlug.org/centos/5.5/isos/i386/
http://data.nicehosting.co.kr/os/CentOS/5.5/isos/i386/
http://ftp.nsysu.edu.tw/Linux/CentOS/5.5/isos/i386/
http://ftp.tcc.edu.tw/Linux/CentOS/5.5/isos/i386/
http://ftp.isu.edu.tw/pub/Linux/CentOS/5.5/isos/i386/
http://mirror01.idc.hinet.net/CentOS/5.5/isos/i386/
http://ftp.twaren.net/Linux/CentOS/5.5/isos/i386/
http://ftp.cse.yzu.edu.tw/pub/CentOS/5.5/isos/i386/
http://mirror.yandex.ru/centos/5.5/isos/i386/
http://mirror.corbina.net/pub/Linux/centos/5.5/isos/i386/
http://ftp.chg.ru/pub/Linux/CentOS/5.5/isos/i386/
Mirrors Verified Sun Sep 26 22:00:54 2010 UTC
Or use bittorrent to download the .torrent files
provided.
Bittorrent is a peer to peer download system described at http://bittorrent.com/
An rpm for CentOS-3 or CentOS-4 is available at
http://dag.wieers.com/packages/bittorrent/.
(Use the latest el3 version
for CentOS-3, or the latest el4 version for CentOS-4)