Book of Time 3D

The program is easy to download and install (just click the executable), and is fairly customizable. You control how often the pages turn, how loud the flipping is, and whether your desktop goes black or remains visible when the book appears.

There are no nag screens; in this demo version, the clock stops after 5 minutes. Registering the screen saver for $15 keeps the clock running, replaces the "unregistered" label on the pages with the time and date, and gives you tech support via e-mail and a free upgrade to current versions.

--Kim Saccio-Kent