Russ asked me to email to let people know that we have an I2-attached mirror available:

ftp.osuosl.org

It will resolve to our I2 mirror (in Corvallis, OR) if you are coming in on an IP from I2, otherwise that will get you to our non-I2 mirrors (currently in Chicago and soon to be another in NYC). We currently have anonymous ftp/http/rsync setup at that address. If there's a lot of demand, we may consider opening up the CentOS tree to allow other mirror admins "early access" to releases -- but then again, it may be easier for us to just allow CentOS to add another centos-controlled mirror on our network...

-Jeff