You were looking for:
Apple premiers Aperture 1.5 at Photokina
Continue to the storyThe new version of Aperture can also generate high-resolution previews of each image so that users can review, rate and organize images as well as perform slideshows -- even when the master images are offline. The previews, which can be generated at a range of size and quality levels, make it possible for photographers to keep their original images safely stored on a desktop system at home or in the studio, while still being able to take a compact version of their entire photographic library on the road using a MacBook or MacBook Pro.