What are some good apps. Please Read.
Some good overlay apps. I have one, but it isn't good. Oh and can it be free?
There are good overlay applications like map overlay tracer. Another application is the camera overlay which is also great to get and it is fun. You can check them out at http://www.musicalgeometry.com/?p=821 or http://itunes.apple.com/us/app/map-overlay-tracer/id389230228?mt=8.