Just thought I'd mention that I saw the following fly across one of the CentOS mailing lists today.
Karanbir Singh wrote:
> hi Guys,
>
> bugzilla.redhat.com now has direct support for cross referencing a
> CentOS Bug/Issue number. So when filing issues upstream that were
> reported on bugs.centos.org, check:
>
> Add External Bug: CentOS