Joseph Linaschke over at ApertureExpert.com has an excellent article that goes over in detail one of my favorite new features of Aperture 3: the ability to not only manage multiple libraries, but to synchronize them as well. If you work with Aperture on both a desktop and a laptop, it is now possible, for instance to have a pared down version of your library that goes on the road with you, and can be synced back to the main library once you’re back home. You can also export any project (or album or book, etc.) as a Library, move it to another machine, and open it up with no fuss. Changes made to the project — including metadata, adjustments, etc. — on either machine are applied when you sync, and Aperture does a great job handling conflicts between the two, allowing you to specify which library’s changes should take precedence. Head on over to the article for more details on how it all works.