All of my notes are on my home PC. I guess I could write bits and pieces of the book, but I wouldn't be able to accomplish much.
Organization is extremely important. The layout of my pages/words plays a huge part in how the story unfolds, so I would be severely limited in what I could write from memory. (Mine is terrible)
I could work on others, I guess, but I'm worried about venting creative energy that could be better applied the main work.