you might have already experienced that in (from today) old versions of AndEngine the CollisionDetection sucked big time - rotation and scaling of the objects was simply ignored.
Yesterday and today I was on the 'Pixel Perfect' Collision Detection in AndEngine.
Not bad hm
I also added an Example:http://code.google.com/p/andengineexamp ... ample.java
So don't forget to grab the latest andengine.jar
from the repository to get in touch with this cool stuff