I wrote a couple of weeks ago about how I planned on picking back up an old paper notebook and filling it with anything and everything I can think of.
2 weeks in and so far so good, but this weekend I discovered the above book and it's expanded the possibilities even further. It takes Merlin Mann's advice of "nothing doesn't go in here" and runs with it.
I can't recommend it highly enough. Buy one for yourself, buy it as a gift for someone you love (I wish someone had given me this years ago). Just get one and start writing.