Little late on this one, but the hard working guys over at leJOS have released the leJOS NXJ alpha 0.2.0 build. In case you are not familiar with leJOS, it is an advanced Java programming system for the NXT or RCX. This newest version of leJOS offers Bluetooth, Ultrasonic sesnor, and sound support. Please keep in mind that it is a work in progress, but you can grab it from the download page.
Quoted from the leJOS Website
leJOS NXJ Alpha 0.2 is now available. This release contains preliminary Bluetooth support, I2C support (Ultrasonic sensor), and sound support. There is no menu system yet so you still only get one run per upload
Link to leJOS: http://lejos.sourceforge.net/index.php