It is amazing to see Simon in action. He shows a lot of infectious enthusiasm and passion about Haskell and is an engaging and witty speaker. My only complaints with the video are that the voices of the members of the audience were not audible when they were asking numerous questions and that the projected slides were barely visible in the video, making it a bit irritating to have to shuffle back and forth between the video and the slides in a separate reader application.
Haskell comes across as a language well worth learning. It is a functional programming language that emphasises purity and laziness, while making it seemingly simple to interface with native code and embrace state. "A History of Haskell" (PDF; about 1 MB; 55 pages) gives an interesting account of the genesis of this programming language. It is difficult to miss Haskell if you read programming.reddit.com.
My resolve to learn Haskell has become stronger after having watched this video. If you are interested in computer programming, you owe it to yourself to check out this video.