PicLens transforms your browser into a full-screen, 3D experience for viewing photos and videos across the web. With one click, PicLens makes online media come to life via an immersive presentation that goes beyond the confines of the traditional browser.
The most important new feature added in Leopard is undoubtedly Time Machine, Apple's attempt to encourage the vast majority of users who never, ever routinely back up their data to change their ways. Time Machine automatically backs up a Mac's files to a separate hard drive (internal or external, though external is certainly safer and more convenient) or a network volume being shared by another Mac running Leopard.