The OpenMx website will be down for maintenance from 9 AM EDT on Tuesday, September 17th, and is expected to return by the end of the day on Wednesday, September 18th. During this period, the backend will be updated and the website will get a refreshed look.
I think Tim was referring to the helper functions created (primarily by hermine and mspiegel, I think) for the 2010 Boulder Twin Workshop.
There's a link to the source file in this thread:
http://openmx.psyc.virginia.edu/thread/404