Google Music Lab - Interactive experiments that use the Web Audio API
Studio Amplify - Create cutting edge music and audio apps
YuMe - A multi-screen video advertising company providing digital video brand advertising solutions.
Groovebox: Beat & Synth Studio - Make Music & Play Instruments
Cheese Posties - Ready-to-grill cheese sandwiches in the mail
Theremin - Multitouch synth instrument that makes an array of sounds