In addition to your app, my favorite astronomy supplemental tool is a green laster pointer. Here:http://www.kk.org/cooltools/archives/001420.php
Here: http://www.kk.org/cooltools/archives/001420.php
It really does allow you to point to stars. One tip: if you have ocassion to go to China, pick one up there. You can get very powerful ones for $15.