Goog has introduced searching some of the Youtube content to be searched with text. That is to say :
"...........With the help of our speech recognition technologies, videos from YouTube's Politicians channels are automatically transcribed from speech to text and indexed. Using the gadget you can search not only the titles and descriptions of the videos, but also their spoken content. Additionally, since speech recognition tells us exactly when words are spoken in the video, you can jump right to the most relevant parts of the videos you find. ..........."
 political videos meet Google speech-to-text technology

I think its a very nice feature, it should also be introduced in Soapbox, if its not there.