After years of notebook use, I've recently fallen in love with index cards. I hesitate less before writing down a probably-bad idea (some of which turn out to

After years of notebook use, I've recently fallen in love with index cards. I hesitate less before writing down a probably-bad idea (some of which turn out to be good) because it won't permanently "contaminate" a notebook. I can sort & re-order, keep my tasks separate from ideas, and scrap cards when they are dealt with. When I would use notebooks, I liked to keep one per project/client/theme, so now I no longer need to carry multiple notebooks everywhere -- just a small stack of blank cards.