We have a test THREDDS server running at http://motherlode.ucar.edu:8088/thredds/ with an enhanced catalog at: http://motherlode.ucar.edu:8088/thredds/catalog.1.0.xmlit includes a utility to convert old (version 0.6) catalogs to the new syntax.
We hope to make this the default, stable THREDDS server on motherlode ASAP, so please look at it if possible and give us any feedback.
You might want to look at it with the latest THREDDS viewer: http://www.unidata.ucar.edu/projects/THREDDS/tech/viewer/index.html