I had some discussion on the tc-users group about my work getting Clojure to work with Terracotta. One of the issues was AtomicReference being unsupported. It was suggested that it would be a simple enough task for a non-TC developer to complete.
I think I did this right, not sure. I removed the permanent exclude for AtomicReference, added a test case, and added AtomicReference to the Jdk15PreInstrumentedConfiguration class.
Let me know if something isn't right, and I need to rework it.
I e-mailed a copy of my scanned contributors agreement yesterday (2009-04-02).