With the most recent updates of iPhoto and Aperture, there is no reason to "bring the Aperture images into iPhoto". The two programs' Libraries have the same file format. You can open any Library in either program.
See this page for information on how to merge your Libraries into one:
I suggest merging everything, and then using Aperture to weed and prune your collection, and to lay out new flower beds.
You can easily filter in Aperture for Images that have adjustments applied. Use the filter Rule "Adjustments" set to "Are applied". Add the Rule to the Filter HUD if it's not there.
Good luck. As you know, setting up a good import and processing workflow is the only way to avoid getting swamped by your productivity.
Thanks for the response. I am trying to combine libraries as I'll be moving to a computer that will only have iPhoto and I would like the convenience of having everything together in one (very large) library. Aperture is V3 and whatever the latest update happens to be. And I'm using iPhoto 11, also with the latest update.