Keeping a sketch book for me has always been a problem, because of the way I process information. Usually when i learn something I tie it to something else and thereby building a web of experiences, that all correlate an build on each other. The linearity of an old sketch book tends to separate thoughts instead of unifying them. There is no way of keeping a current dynamic log of events and things that you have seen and read. This is why I use a computer to keep ideas together, because i can always search through stuff to find it, spending less time organizing things and more time producing. Especially with what I do, I need a dynamic way of tagging things and keeping a constant flow of ideas.