J2SE 5.0 SCSL source available
If you are just getting started with the Sun source and are interested in the linux port then I can recommend getting involved with the blackdown.org porting project. There are years of porting experience contained in that group and also experience with the TCK, both Hui and myself are also on the alias along with experts like Juergen so you should get to the right folks.
I've also posted some scsl questions/answers to the JDC forums. In particular about the gcc compiler options we used.