The next two modules I will be building for Node.js are a speech synthesis and a Bluetooth wrapper. No, they won't be doing the super low level stuff like talking directly to Bluetooth hardware or generating audio from english text. Instead they will be wrappers for existing open source programs.
The Bluetooth module will work with hcitool and Bluez programs to provide similar functionality as my wireless module, e.g. trigger an event when a device is near, pairing, mounting filesystems.
The second module will be really simple. It will handle speech synthesis thanks to the Festival program. The voice will be as configurable as Festival will allow, and there will be callbacks for when a string has finished being spoken, to prevent messages from overlapping.
Both modules (as soon as I make them) will be available in npm.