This free site features public lectures, teaching material, interviews with leading academics, information about applying to the University, and much more. All the material is arranged within a series of related talks or lectures and may be in audio, video or document format. A full list of all series is available.

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Content is being added regularly to the site. All content is free for you to download and watch or listen to. By November 2011 there have been over 220 series released containing around 3,000 items.
Link 1: University of Oxford Podcasts - Audio and Video Lectures [Featured Series]

Link 2: Series | University of Oxford Podcasts - Audio and Video Lectures [All series, sorted (descending) by date of update]