http://centos-distro.cavecreek.net/centos/5.5/os/x86_64/
http://centos.secsup.org/5.5/os/x86_64/
http://mirrors.xmission.com/centos/5.5/os/x86_64/
http://mirrors.greenmountainaccess.net/centos/5.5/os/x86_64/
ftp://repo.genomics.upenn.edu/centos/5.5/os/x86_64/
http://mirror.san.fastserv.com/pub/linux/centos/5.5/os/x86_64/
http://mirrors.finalasp.com/CentOS/5.5/os/x86_64/
http://mirror.singleedge.com/pub/centos/5.5/os/x86_64/
http://ftp.usf.edu/pub/centos/5.5/os/x86_64/
http://mirrors.igsobe.com/centos/5.5/os/x86_64/