<i>It’s possible the iPad will allow apps to have push notifications with audible alerts</i><p>that got me wondering about the hardware differences between the ipad and iphone.<p>has anyone looked at the sdk yet that can verify whether the ipad os works the same with respect to push notifications?  does the ipad have the hardware to vibrate?  when you push the power button on it does it just shut off the display like an iphone or go completely to sleep like a laptop?  if it's completely sleeping, does it wake up on a timer to display notifications like calendar alerts?  but then how can it handle incoming push notifications from applications if the wireless radios are off?  with a month-long standby time i have to imagine it's a pretty deep sleep and can't keep the wireless/3g radio on that entire time.  my kindle can only survive about a week with the 3g radio on while not doing anything.