I'd love to see one with some space on the side dedicated to more involved analog circuit calculations. Maybe a small (40mm?) plot with BJT curves (not labeled with numbers, of course, but following the usual shape) for quick load line approximations, semilog for frequency domain stuff, maybe some of the more commonly forgotten formulas (RC step response, RMS/peak/avg ratios of common waveforms, propagation delay of coax, etc.)
I might be the only one, though. I like to design my circuits without Internet access - lets me clear my head a bit more. Most people, I think, would just Google or SPICE these things.