Updated: July 2nd (XE7)
Ron Amadeo of Android Police did a review of these experiments: http://www.androidpolice.com/2013/05/24/google-glasss-hidden-labs-features-ok-glass-everywhere-web-browsing-video-stabilization-and-more-video/
Google Glass has a series of Labs experiments that can be enabled on engineering or userdebug builds. Using APKTool, I've removed that restriction and now they can be enabled with root access.
To start, for example, the SOUND_SEARCH lab, type in a root shell