Today Apple has released an update to their photo workflow app, Aperture. Aperture 2.1, a free update for all Aperture 2.0 users, adds a new, and open, plugin architecture to Aperture. This means it will now be much easier for developers to extend Aperture's builtin capabilities by writing little bits of codes that plug into the Aperture frameworks (hence the name).
Apple is already working with some developers, and is including a dodge and burn plugin of their own with Aperture 2.1. Aperture 2.1 is available now, and if you don't already have Aperture it will cost you $199 (or $99 to upgrade from Aperture 1.0).