Although by no means obscure, I am a little surprised this video hasn't had more hits. This is a great 6 minute piece by Google members on the evolution of search (you may have gotten that from the title).
Not only does it tell you something about search, it also shows what can happen when people love their jobs, and are there to keep improving. High consumer expectations met enthusiastic workers with great creativity, and we take the journey from Stanford search, to Universal to Instant.