Have you checked Google Labs has discovered new technology called Gaudi. Google Audio Indexing (Gaudi) which is based upon speech technology. Now you do not have to wait for actually what you want to listen in YouTube videos. This technology creates break points where the search term used and let you jumps at the exact portion of the video. Check it out: http://labs.google.com/gaudi
Yeah saw this. This one is quite interesting. Just thinking of the future.. We "speak" the keywords we want to rank for, and google finds the keywords and ranks us! Then we have to worry about "spoken" keyword density! Early days with this, but I am impressed at it's capabilities already. Cheers Tim