Searching based on the content of audio and media files

I was just reading about these sites in Pandia:

“EveryZing creates a text index of the audio data from audio and video files, using the industry’s leading speech-to-text technology from BBN Technologies, to enable search within the spoken words of media, not just within the metadata.”

In this respect it is a bit similar to blinkx. Both blinkx and Everyzing analyze the content of the audio track of media files.