I keep a doodled form of this note guide on my desk when I compose, since my sight reading is absolute crap. When limited to E1-E7 (lute range), it fits pretty well on a note card. Add a few things about key signatures (D-flat major: everything flat but F and C), and I'm pretty much good.
This is, of course, a minimum for me because I understand rests and other basic notation. Maybe with a few more pictures it would work as a universal cheat sheet?