A common problem with iPod Touch, iPad or iPhone apps is that they sometimes get stuck saying Waiting and they are never fully installed. In this case, you may not be able to remove the app because when you tap and hold the icon, the X never appears.
When this happens, you’ll need to reset your device. Press and hold the Home and Power buttons for about 15 seconds. Ensure you have a connection to the Internet and the device should then restart and allow the “Waiting” apps to fully install.
Sometimes the app will disappear. In this case, try to download or sync the app again.