Yes, something like that would be ideal. A4 paper layout is not quite as ideal as US Letter layout for song charts, but it's workable. (It's slightly narrower, than letter, and my layout style prefers wider, but it's certainly at least as good as that 15.5" Sony Flip laptop I'm considering.)

We brought up E-ink in the other thread, and I loved the idea, I just couldn't find anyone making something like that. That thing's price tag shows why. But still, looks attractive. Really, the ultimate solution for me would be a regular laptop with a hacked-on letter-sized E-ink display taped to the top.

The big advantage of an E-ink display, besides battery life, is that I could use it successfully for outdoor gigs in the sun. That Toshiba convertible tablet I'm currently using is totally lost in sunlight, so I had to go oldskool and print out the set list for our last outdoor gig. Don't know how the Sony tablet would fare in sunlight.