I am please to announce that I have released WiiRemoteJ v.1.4. Both the library and docs are available for download. They are actually zipped and gzipped this time, just so you're aware.
Version 1.4 includes many bug fixes (as usual), with specific emphasis on multiple remote support. Multiple remotes should work much more smoothly now.
In addition, I have added Balance Board support. Note that I don't actually have a Balance Board, so I have no idea if it works. If someone who does own a Balance Board could get back to me on that, I'd be very appreciative. Anyways, please do tell me of any errors in the library or issues in documentation (there are sure to be typos in the Balance Board stuff, since a lot of it was copy/pasted from the Wii Remote documentation). Enjoy!