You can control which application opens when you double-click a shared Aperture/iPhoto library. (All current Aperture and iPhoto libraries are "shared" by default.) This is a handy trick because many photographers open libraries from the Finder instead of from within the application. Here's how to control whether iPhoto or Aperture opens when you double-click on the shared library icon.
More Aperture/iPhoto Tips and Techniques
To learn more about using Aperture and iPhoto together, visit my Using iPhoto and Aperture Together on lynda.com. Also, take a look at our Aperture 3 Learning Center. Tons of free content about how to get the most out of Aperture.
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