Greetings,
I've set up a public mirror of debuginfo. It's available over HTTP and rsync. Syncs every 12 hours (but I'm happy to adjust that if wanted).
http://mirror.picosecond.org/centos-debuginfo/
rsync://mirror.picosecond.org::centos-debuginfo
I couldn't really find a list of debuginfo mirrors. Not sure if I was looking in the wrong place or what.