As promised, here is a display of the OVAL testing progress on scap-security-guide, against the Rules for the STIG profile:
http://scap-securityguide.rhcloud.com/RHEL6/output/table-stig-rhel6-testinfo.html

A very fat green bar in the "Check Text" column indicates that both OVAL and XCCDF have been tested; a note with the testers' names/initials are displayed at the bottom of the associated cell. 

How check attestations are added to the project are covered in previous discussions on the list (and hopefully apparent at a glance in the corresponding input file).

The number of tested checks could increase significantly (momentum!), if some of the templated ones are tested (which would then likely involve adding a tag to the template, at least for the OVAL).  Relatedly, I seem to recall that one of the templated OVAL checks may not quite be right, such as enabling/disabling a service for all runlevels instead of the usual 2-5.