I have collected the examples of mine that I felt were the best and thrown them up on pygame.org.
Mek's Sample Code
Changing the color of the screen with the mouse (basics intro).
Dragging an image around the screen with the mouse.
Moving a sprite in all 8 directions. (no animation)
Four direction movement (with animation)
Rotating tank turret.
Punching a transparent hole in a surface.
Basic platforming and collision detection.
Hope some find this of assistance. If you have any suggestions, comments, or other things you would like to see, please let me know.