That portfolio book was a lifesaver, it seems like too big a luxury for putting scrap notes into, but it makes a huge difference knowing exactly where everything is.  I always kept trying to use a proper notebook but I'd always forget about it, or put notes on scrap paper anyway, or I'd have to swap out notes and the whole thing wound up being disorganized.  This was the perfect marriage of both.  It's too bad they don't make them smaller (at least, the ones that are smaller are for photographs, and that's not what I wanted).