Someone posted this on a different board -- pretty good, just wish they had someone w/ just posing trunks and lean enough to show the pose and what it is activating....
Bodybuilding Poses
Also on the 'other videos' list on the right side of this page, scroll down & you'll see several sections of a bodybuilding seminar that are useful. They are all posted by the same person - "FitnessAtlantic.com" - you can search on that name as well.
I also like these from Bob Chichirillo (see Posing Part 1, 2, 3, etc.)
YouTube - bob cicherillo posing
Here's another resource I came across on another board. Joe Franco - posing as well as contest prep list / tips (Scroll down towards the bottom for some podcasts.)
Team Franco Bodybuilding