I use an iPad, it's screen is just big enough (I wouldn't mind a 12" screen though!) The app that I use, which is made for musicians, is called unrealBook. I have almost 1000 songs now in PDF form for my iPad. It did take me a LOT of hours though, scanning, editing and "cleaning up" some songs, and cropping them tightly so that they fill the screen. I literally don't bring music books or fake books to jams or gigs anymore - just the iPad.
Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys