libjit looks pretty nice; pity Mono didn't take this route. I'm not sure why you'd use this rather than LLVM though.
I've been using mock lately. This is a nice tool that makes it easy to build an SRPM in a particular environment. I'm trying to set up an auto-builder which will build gcj from svn, then use the result to build all the java-based RPMs in Fedora. The idea here is, continuous testing as close to upstream as possible will let us avoid ugly regressions late in the release cycle.
Aspect-Oriented C++. Madness! But, I suppose, one more reason that one might want an API to the compiler's internals.
I didn't realize this before, but Chandler also has a copy of libgcj in it. I suppose this is for PyLucene... funny. Their plan for integrating into distros mentions using the system libraries, python, etc... I wonder if they know about the BC ABI.
I've been interested in Deming's 14 points lately. I'm particularly interested in number 8, "drive out fear", since it has a personal application, but really all of them are worth a read and a think.