I don't in the typical sense. I often have scenes, bits of conversations or other noteworthy bits that pop into my head and ever the optimist, I try and put them in a story.
I must have millions of words now in unfinished stories; ideas that seemed good at the time, but just never went anywhere.
I probably should jot them down, but the question springs to mind about where to put them. Okay, so I have a book - or several with the thoughts in, but then it's a lot of work to reference them quickly. So do I design a database to copy them into and if so, what kind of referencing would I use to retrieve them?
I'll stick to what I do.