We have been sending all build logs via email for people who wanted to keep up with the build history in our CentOS-7 efforts ( ref: http://lists.centos.org/mailman/listinfo/centos-build-reports ), we have now put the same info online at http://buildlogs.centos.org/ . You can now go there and get info about what mock configs were used, what the build roots contained and the results etc.
The root directory indicates the build target, at the moment its C7.00.03, and we will likely iterate over a few times before we get to a point where its useful to build a tree and consider an RC iso set. But from here, we will have all builds for the CentOS-7 scope published there, with the eventual goal of having everything available. Including CentOS-5 and 6.
And the best place to talk about this is the CentOS-Devel mailing list ( ref: http://lists.centos.org/mailman/listinfo/centos-devel )