Very good summary of different user intent, and the kinds of content you should serve up to these different kinds of people. This is great in the keyword research stage, and planning out what sort of content you're going to create. Also talks about how you can turn each type of user into a conversion. This video is likely to give you a few lightbulb moments in the first half. Once he gets into the third tier (action) the diagram starts to get a bit less clear, but even if you just understand the first half, you'll be well ahead of most people!