Screenshot
Chapter 3 – Part 1/3: http://www.youtube.com/watch?v=9elzCvQw7WM
Chapter 3 – Part 2/3: http://www.youtube.com/watch?v=H3xMWM_QPtQ
Chapter 3 – Part 3/3: http://www.youtube.com/watch?v=J46wREWtQW8
Screenshot
Chapter 3 – Part 1/3: http://www.youtube.com/watch?v=9elzCvQw7WM
Chapter 3 – Part 2/3: http://www.youtube.com/watch?v=H3xMWM_QPtQ
Chapter 3 – Part 3/3: http://www.youtube.com/watch?v=J46wREWtQW8
This is a sample program i made for a friend of mine. It simply overlays an OpenGL program with an FPS counter, but can also be modified to display geometry as well.
YouTube
http://www.youtube.com/watch?v=CFucIgCg6K8
Source code and binaries
Screenshot
Chapter 2 -Part 1/1: http://www.youtube.com/watch?v=LdL4bRc101M
Screenshot
Chapter 1 -Part 1/4: http://www.youtube.com/watch?v=_mcs1pR2vLw
Chapter 1 -Part 2/4: http://www.youtube.com/watch?v=AOXlihXC0yY
Chapter 1 -Part 3/4: http://www.youtube.com/watch?v=JsN-affqqR4
Chapter 1 -Part 4/4 http://www.youtube.com/watch?v=bk6piV6FGX0