Mailing the story:
CentOS 5.6 is released! Upgrade now from CentOS 5.5 to 5.6
Good news for CentOS users! CentOS 5.6 is here. This is the sixth update released for CentOS 5, making the latest release version 5.6. The latest release supports both i386 and x86_64 architectures, it contains a number of bug fixes, new functionality, and updates.