We haven’t yet covered operating systems as a part of PenTestIT. However, we are thinking that we should start covering operating system/kernel/application updates too. Starting with CentOS, that has released its new and improved operating system CentOS 6.0 for i386 and x86_64 architectures.

It is based on the upstream release EL 6.0 and includes packages from all variants. All upstream repositories have been combined into one, to make it easier for end users to work with.

Download
http://www.centos.org/modules/tinycontent/index.php?id=30