This is a great “pixel perfect bitmap collision detection with rotation” script by Grant Skinner. This is definitely better than hitTest for rotated irregularly shaped objects and bitmap images. Works great with transparent pngs as well.
Preview
Download Fla Sample
Original Bitmap Collision detection class by Grant Skinner
http://www.gskinner.com/blog/archives/2005/10/source_code_sha.html
Update
AS3 version of this script is available here:
http://www.freeactionscript.com/2011/08/as3-pixel-perfect-collision-detection/
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