Apple has pushed out updates to its iPhoto and Aperture apps. The updates add a number of fixes and also bring support for the new Retina display MacBook Pro. However, one significant new feature to each app is unified photo libraries. From the Mac App Store Aperture description:
New unified photo library for both iPhoto (v 9.3 or later) and Aperture; no import/export required; Faces, Places, slideshows, albums and web sharing work across both applications.
This will be a welcome change to photographers who used both Apple's pro and consumer-level photography apps. Previously, Aperture and iPhoto used different libraries, which meant that users had to import and export photos from one library into the other. Now, after a single import from the camera, all photos are available to both apps.
Currently, the updates are only showing up for iPhoto and Aperture in the Mac App Store and not via OS X's Software Update, but expect them to show up there shortly.