I'd like to add my voice to this topic. To me, i this feature is imperative, and as one who has programming experience, I can't imagine it would be hard to do or take much time to implement. I have Illustrator, CorelDraw, and now AD, and I find myself going to AD more and more often. So far the ability to align to a key object that stays in place is probably the number one feature I would like to see implemented, followed by export to Illustrator (a distant second) and bitmap trace (a far distant third).
Keep up the good work, and please put this feature in the queue.
Edited: Just found out about the alignment handles. That's a definite improvement, but I'd still prefer to do something like select all the items to align, shift-click the key object, and then click the requisit alignment tool on the alignment group of the toolbar. Or even simpler, align to the first or last selected.