I've been trying to keep up on this too, so I spoke to someone at Optitrack the other day just to see what their take on software is, and it looks like they're pretty much counting on people like Yoshi to create the user interface(s) for the hardware. The person I spoke to seemed to allude to Yoshi's product as one that was in development. I emailed Yoshi after that, and he indicated that he hopes to have his app finished by the end of the year. Yoshi's site has an update dated 6/19.--Tim