eXtace is a 3D audio visualization tool (or eye candy depending on how you look at it). eXtace requires ESD (Esound) for its sound input source. It performs a FFT (fast fourier transform) on audio and displays it via various graphical modes.
The Lazybones project is a server and a collection of clients. It allows one person to voice control multiple machines. Designed for software developers and sys admins, Lazybones speeds up redundant and/or complex tasks.