I am a fan of being able to take notes, log your own behaviour (and track time) and do other things off the command line. I like the approach.

Pedagogically speaking, I'm curious if this will actually help. It seems to me that note taking and review is definitely an important part of learning, but I've found that writing out in long-hand and being able to draw diagrams helps considerably. None of it useful without regular review, and application too. I'd be curious to hear other people's thoughts on this approach from a retention/review perspective.