Late last month, Dries Buytaert presented Drupal to the Vancouver PHP Association, and I recorded it on my Powerbook. The quality is such as it is because of my sitting far away, Dries' relative soft-spokenness, and because I had nowhere but my lap to put the Powerbook. Or maybe the problem was between the chair and keyboard, but I will deny that categorically if accused. The 76 MB MP3 of the presentation is available, and there were questions afterwards, most of which are included but may not have been picked up.
It was Dries' first presentation about Drupal, and he says he whipped it up quickly, but if so, I was impressed with the level of technical detail included in it.