It's not really an image manipulation program - it only has light editing features. It is very similar to Aperture - import, catalog, and arrange the images, export to PS if it needs adjustment, then print/publish.

It's a nice program. The beta has been out for Macs for a while now. I think Aperture scared Adobe a little. Aperture, by the way, has come a long way from its half-baked release.