Actually, I think Apple prefers that you NEVER turn your iPad off. Steve Jobs didn't like on/off buttons. I leave mine on 24/7 and charge it will in its case. Absolutely no problems. The iPad 2 is very energy efficient and will use very little, if any, power while in sleep mode.
Agreed. My hope is the 10th generation iPad will have a surgically implanted option with ocular holographic display. Bye bye bifocals.
AA