In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org
The following mirrors should have the cd .iso images available:
ftp://ftp.ussg.iu.edu/linux/centos/4.8/isos/x86_64/
http://mirrors.kernel.org/centos/4.8/isos/x86_64/
http://ftp.osuosl.org/pub/centos/4.8/isos/x86_64/
http://mirrors.xmission.com/centos/4.8/isos/x86_64/
http://mirror.its.uidaho.edu/pub/centos/4.8/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/4.8/isos/x86_64/
http://centos.mirror.nac.net/4.8/isos/x86_64/
http://mirror.vcu.edu/pub/gnu+linux/centos/4.8/isos/x86_64/
http://mirror.nexcess.net/CentOS/4.8/isos/x86_64/
http://mirror.trouble-free.net/centos/4.8/isos/x86_64/
http://holmes.umflint.edu/centos/4.8/isos/x86_64/
http://centos.mirrors.tds.net/pub/linux/centos/4.8/isos/x86_64/
http://mirrors.versaweb.com/centos/4.8/isos/x86_64/
http://mirror.stanford.edu/yum/pub/centos/4.8/isos/x86_64/
ftp://mirror.nyi.net/centos/4.8/isos/x86_64/
http://centos.mbni.med.umich.edu/mirror/4.8/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/4.8/isos/x86_64/
http://ftp.usf.edu/pub/centos/4.8/isos/x86_64/
http://centos.cs.wisc.edu/pub/mirrors/linux/centos/4.8/isos/x86_64/
http://mirror.highspeedweb.net/CentOS/4.8/isos/x86_64/
http://centos.secsup.org/4.8/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/4.8/isos/x86_64/
http://mirrors.serveraxis.net/centos/4.8/isos/x86_64/
http://mirrors.easynews.com//linux/centos/4.8/isos/x86_64/
http://mirrors.arsc.edu/centos/4.8/isos/x86_64/
http://linux.mirrors.es.net/centos/4.8/isos/x86_64/
http://mirror.atlanticmetro.net/centos/4.8/isos/x86_64/
http://hpc.arc.georgetown.edu/mirror/centos/4.8/isos/x86_64/
http://mirror.anl.gov/pub/centos/4.8/isos/x86_64/
http://mirror.rackspace.com/CentOS/4.8/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/4.8/isos/x86_64/
http://centos.mirror.netriplex.com/4.8/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/4.8/isos/x86_64/
http://mirror.icpl.org/centos/4.8/isos/x86_64/
http://centos.corenetworks.net/4.8/isos/x86_64/
http://centos.omnispring.com/4.8/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/4.8/isos/x86_64/
http://ftp.lug.udel.edu/pub/centos/4.8/isos/x86_64/
http://mirrors.adams.net/centos/4.8/isos/x86_64/
http://mirror.clarkson.edu/centos/4.8/isos/x86_64/
Mirrors Verified Sun Sep 5 19:18:44 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)