The Projects list has a new Manual sort option that allows you to organize your project containers in any order you want. Previously, you were limited to sorting by Name, Date, and Library.

You also can now import, view, and trim AVCHD video within Aperture, which makes it more compatible with cameras that use this movie format.

And for those making the move to Aperture from iPhoto, the first time they open Aperture, they will see the message, Do you want to open your iPhoto library? This certainly eases the transition from one app to the other.