Quickly following the news of Yahoo! VideoSearch was the release of Blinkx TV Video Search. Despite its name, Blinkx also searches radio programs.
But Blinkx goes a step beyond Yahoo! and other video search engines by using speech recognition technology to transcribe the broadcasts, thereby enabling users to keyword search the entire clip. Although the transcripts are fairly primitive, this seems to offer a great step forward in accurately identifying the content of a broadcast.
According to SearchEngineWatch contains more than 47,000 hours of content from various content partners including Fox News, NPR, ESPN, and the BBC.
Source: inter alia