Here's the video of the lecture I gave last week at Stony Brook University, which was the basis of my recent blog post. I've uploaded the slides as a pdf here. (You can read the slides online or download them by going to the File drop-down menu.) I'm not sure what the ideal combination of video and slides would be...if anyone has any suggestions, let me know. [Update--the video url got switched around. This should work now...] http://www.youtube.com/watch?v=vsY9tSqvLik