Cool: Really interesting command line utility to record what I'm currently doing. I'd love that. task warrior is nice to track my tasks, but to track what I'm doing/what I've done? So far it's not a good match.
Not for me: Uses a format of some application that I've never heard of, on OS X which I don't own.
Since this is the first time I heard about TaskPaper: Are there alternatives for the other two big operating systems (or at least one of them)?