Nothing. You all should use Hydra, now called SubEthaEdit. It rocks and is lightweight as well. Personal Write does have a smaller codebase, and therefore takes up less room, but with the number of other activities in my life at the moment and for the forseeable future, I will not be updating the app. Those who use Personal Write b/c of the small application size (188KB) for special and enhanced uses (bootable USB, Zip, floppy, etc.) The possibility of incorporating the ability to load tablature as well as lyrics and have it highlight areas at a set tempo? For the present time, still a ways off in the distance. It will still be free.