There is a review request for python 2.6 on bugzilla for centos 5: https://bugzilla.redhat.com/show_bug.cgi?id=573151

When this is going to be pushed to EPEL, all dependances on python 2.5 will be replaced by this new python 2.6 and python 2.5 rpms removed from the Debroglie centos repository.