Not bad, huh? Several people have asked about how this is done and, now that I have a working sample (with one or two small issues that need to be resolved), I can create a tutorial. So, if anyone out there has a simple-ish module that illustrates code completion, code folding, or identifier hyperlinking, PLEASE let me know! Those are areas that really need to find their way into a tutorial.
By the way, if you want to contribute to (or read up on) docs on NetBeans module development, check out the new (and growing) NetBeans Module & Platform Development Work-in-Progress Page. Your tips and tricks (or anything else) are 100% welcome!