Do you keep a sketch book? I take one with me almost everywhere. I usually have two or three small books for doodling at any one time because I'm so scattered that I always misplace at least one of them.
My sketch books aren't really all that sketchy. They are mostly filled with word associations, lists and written ideas with a few quick scribbles here and there. If I didn't put them on paper I'd totally forget 3/4 of the things that run through my head :)
