Everything I've written is on the computer, and everything I'm actively trying to learn for performance ends up there, so it's easy to print fresh copies. A fast laser printer helps. I can also print out just the lyrics for a concert set, although last-minute changes occasionally trip me up there.

The biggest problem is remembering to transcribe changes and annotations before I toss the old copy. And I'm going to have to add special handling for performance notes and transposed chords, now that I'm collaborating with people who don't use capos.