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In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org

The following mirrors should have the ISO images available:

http://centos.mirror.nac.net/4.9/isos/x86_64/
http://bay.uchicago.edu/centos/4.9/isos/x86_64/
http://mirror.ncsa.illinois.edu/centos/4.9/isos/x86_64/
http://centos.corenetworks.net/4.9/isos/x86_64/
http://yum.singlehop.com/CentOS/4.9/isos/x86_64/
http://mirrors.greenmountainaccess.net/centos/4.9/isos/x86_64/
http://mirror.vcu.edu/pub/gnu+linux/centos/4.9/isos/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/4.9/isos/x86_64/
http://mirror.anl.gov/pub/centos/4.9/isos/x86_64/
http://mirror.rackspace.com/CentOS/4.9/isos/x86_64/
http://mirrors.adams.net/centos/4.9/isos/x86_64/
http://mirror.sanctuaryhost.com/centos/4.9/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/4.9/isos/x86_64/
http://mirror.metrocast.net/centos/4.9/isos/x86_64/
http://mirror.web-ster.com/centos/4.9/isos/x86_64/
http://pubmirrors.reflected.net/centos/4.9/isos/x86_64/
http://mirrors.netdna.com/centos/4.9/isos/x86_64/
http://mirror.raystedman.net/centos/4.9/isos/x86_64/
http://mirrors.liquidweb.com/CentOS/4.9/isos/x86_64/
http://mirror.flhsi.com/centos/4.9/isos/x86_64/
http://mirror.symnds.com/CentOS/4.9/isos/x86_64/
http://mirrors.bluehost.com/centos/4.9/isos/x86_64/
http://mirror.7x24web.net/centos/4.9/isos/x86_64/
http://mirror.hmc.edu/centos/4.9/isos/x86_64/
http://mirrors.seas.harvard.edu/centos/4.9/isos/x86_64/
http://mirror.trouble-free.net/centos/4.9/isos/x86_64/
http://mirrors.easynews.com//linux/centos/4.9/isos/x86_64/
http://mirror.ash.fastserv.com/pub/linux/centos/4.9/isos/x86_64/
http://centos.mirror.freedomvoice.com/4.9/isos/x86_64/
http://ftp.osuosl.org/pub/centos/4.9/isos/x86_64/
http://mirrors.sonic.net/centos/4.9/isos/x86_64/
http://www.gtlib.gatech.edu/pub/centos/4.9/isos/x86_64/
http://centos-mirror.jchost.net/4.9/isos/x86_64/
http://centos.cs.wisc.edu/pub/mirrors/linux/centos/4.9/isos/x86_64/
http://mirror.atlanticmetro.net/centos/4.9/isos/x86_64/
http://centos.sonn.com/4.9/isos/x86_64/
http://mirrors.loosefoot.com/centos/4.9/isos/x86_64/
http://mirror.ubiquityservers.com/centos/4.9/isos/x86_64/
http://mirrors.cat.pdx.edu/centos/4.9/isos/x86_64/
http://ftp.usf.edu/pub/centos/4.9/isos/x86_64/

Mirrors Verified Mon Mar 12 22:42:23 2012 UTC

Or use bittorrent to download the .torrent files provided.

Bittorrent is a peer to peer download system described at http://bittorrent.com/ and there are many clients available.

These include (in no particular order of preference): utorrent, vuze (Azureus), BitTorrent, Deluge, ctorrent, ktorrent, rtorrent and transmission.

Packaged copies of various torrent clients for CentOS can be found in the repositories listed in the following wiki article : http://wiki.centos.org/AdditionalResources/Repositories