The Nmap NSE script to probe for Sun Service Tags that I wrote last December has been committed to the Nmap trunk. Many thanks to David Fifield for his advice, testing and elegant refactoring of my newbie LUA code to make it more robust.
I expect the code will live on in the Nmap subversion repository rather than my own from now on. If you'd like to use the script you can get it from here or wait until the next release of Nmap to come out.