The latest addition to the ActionScript 3 with Flash CS3 tutorial
is an example in the display objects section covering creating objects (movie clips and bitmaps) dynamically from the library. In addition to placing them on the screen, they are also arranged based on their vertical position so those objects higher on the screen are arranged below those lower.
The tutorial is also now divided into more pages. It was getting pretty lengthy and this breaks it up a little bit. More pages are most likely going to be added, especially as content for the OOP section is developed.
This newest example can be found about half-way down page 2