When I get an app that is stuck on waiting, sometimes I delete the icon. However, I have to reboot to get it to go away. I end up holding the power button until the slide to turn off button shows up. After it has fully powered down I turn it back on and try the download again. Other times I end up downloading it to my computer and then install it through iTunes. This problem has happened on my iPad about three times so far.
Sent from my iPad using iPF - Peace