CentOS Net Install
From KlavoWiki
Download the 10 MB net install ISO image and boot from the CD. Configure the appropriate IP settings and select select HTTP install.
For BigPond Users. Free download.
Address mirror.aarnet.edu.au folder pub/centos/5.6/os/x86_64/
Another Australian site for downloading.
Address ftp.monash.edu.au Folder pub/linux/CentOS/5.6/os/x86_64/
New Zealand Site
Address ftp.wicks.co.nz Folder pub/linux/dist/centos/5.6/os/x86_64/