A preview of the NXT Bluetooth communications is available for insiders (i.e. no web page announcement). The readme file has some instructions for setting things up and Test.java shows how to makes a few calls to motors and sensors:
www.lejos.org/NXTCommand_Preview.zip
Feel free to post your experiences here. I understand RXTX works for Unix and Macintosh, so if anyone wants to make some setup instructions for those platforms it would be appreciated.

