Update to previous post:
Here are the locations of the training videos. If you haven't used Lynda.com you need to subscribe. It costs $25 per month but you can cancel right after going through the videos.
I found them to be very helpful to understand the unique features of Aperture. I'm starting to like it a lot more now.
Hope you also find them helpful.
Mike
http://movielibrary.lynda.com/html/modPage.asp?ID=321http://movielibrary.lynda.com/html/modPage.asp?ID=242