I heard once that the artist Prince has like a thousand never released songs locked up somewhere. He presumably can materialize a hit anytime he needs a little attention, or perhaps a few extra bucks.
On a substantially smaller scale I have this inventory of articles, some complete, some half-written. I keep my iPad with me at virtually all times. When an idea comes to me, I grab it and start typing (often just a sentence or two as a reminder for my early morning writing sessions). I had a friend tell me recently that he drove by me somewhere over Pacheco Pass (California) - I had pulled off to the side of the road. He didn