Podscope is a search engine that lets you search for spoken words within any audio or video file. The service is currently focusing on podcasts with other media types to be added over the coming months. This is a technology that actually searches within the audio data, not the text transcript.
By clicking on the (+) sign next to each result, you can play snippets of about 10 seconds of audio surrounding your matched search term.The site uses Macromedia Flash™ to stream the audio snippets.
This beta version is to evaluate the system under load to determine areas needing improvement and gather user feedback.
There’s a firefox plugin for podscope here.