Chris_Pratley's OneNote WebLog : Unifying the analog and the digital with OneNote: "One of the long term visions for OneNote is to bring together 'your information' and make it findable and reusable, regardless of format. When we look at the types of info we try to help people organize, it is obvious that a lot of it lives outside the digital realm: Business cards, handouts, receipts. People always have a collection of paper that accompanies their PC because it is hard to include that stuff in their digital storage. Beyond paper, there are other analog forms of information such as speeches (audio) and 'performances' (video). You hear and see things today, but all you have are your memories of that, or maybe a recording on tape or mini-recorder. As you know from the current release of OneNote, there's a lot of value in just being able to capture various kinds of information in one place: text, HTML, ink, photos, audio/video recordings. In OneNote '12', we're going to go even farther.
More or less, anything you put into OneNote 12 becomes searchable."
See the full post for, e.g., details on searching audio/video content.