Oracle Linux 5 update 7 ISO images are available for (free) download from https://edelivery.oracle.com/linux since a few days. We had previously released all the packages and created the channels on http://linux.oracle.com for customers with subscriptions.
The freely available yum repository for the 5.7 base channel is online here : http://public-yum.oracle.com
All srpm updates are to be found : http://oss.oracle.com/ol5/SRPMS-updates/
Our GIT repo for UEK with all checkins, changelogs etc : http://oss.oracle.com/git/?p=linux-2.6-unbreakable.git