A couple of my favorites so far:<p><a href="http://www.vimeo.com/6571637" rel="nofollow">http://www.vimeo.com/6571637</a> - Haskell Arrays on GPGPU<p><a href="http://www.vimeo.com/6629455" rel="nofollow">http://www.vimeo.com/6629455</a> - Partial Memoization of Concurrency<p><a href="http://www.vimeo.com/6624203" rel="nofollow">http://www.vimeo.com/6624203</a> - Guy Steele's talk (slides for this were on HN a week or so ago)