Kasparov-Karpov Videos
Starting here, you can find a series of videos made on the Lyon half of the 1990 World Championship match between Garry Kasparov and Anatoly Karpov. (The audio on the first one is poor most of the way through, but it improves after that.) I might have referred to these videos before, but since a reader ("Matt") mentioned them and since Kasparov recently released the final book of his games against Karpov it's worth a second mention.