See here for his enthusiastic review.

The biggest surprise: watching video on the tiny, 2.5-inch screen (320 by 240 pixels) is completely immersive. Three unexpected factors are at work. First, the picture itself is sharp and vivid, with crisp action that never smears; the screen is noticeably brighter than on previous iPods. Second, because the audio is piped directly into your ear sockets, it has much higher fidelity and presence than most people’s TV sets. Finally, remember that a 2.5-inch screen a foot from your face fills as much of your vision as a much larger screen that’s across the room.

Many people — including Apple’s chief, Steve Jobs — have predicted that video on the iPod would never be as popular as music. One crucial reason is that watching requires your full attention. You can’t do something else simultaneously, like driving or working.

In practice, these predictions turn out to be absolutely accurate. (I established this fact through scientific hands-on testing. Unintentionally absorbed in an episode of “Lost” while walking through Grand Central Terminal, I marched directly into a steel support girder.)