For many new Mac owners, the move to Mountain Lion represents your first major upgrade. To help users prepare to make the jump, Erica Sadun and Steve Sande wrote Getting Ready for Mountain Lion, an Amazon/iBooks eBook (US$4.99). It's aimed at first-time upgraders and people looking for hints and tips about smoothing the transition. They're sharing some of their tips on TUAW in a series of posts about the 10.8 upgrade.
Preview, the app that lets you view pictures and read PDFs in OS X, is