Apple has updated Aperture, its all-in-one RAW workflow tool for Mac, to
Aperture 1.5.3. The release notes list the following changes:
Aperture 1.5.3 is available as a free update to licensed users of previous versions, and is available either through the Software Update mechanism of Mac OS X, or it can be downloaded
here (login required). Mac OS X 10.4.8 or later is required; Mac OS X 10.4.9 is a better bet as it adds support for more digital camera RAW files and tweaks the performance of Aperture in several ways described
here.