From MacTake.com

SuperDuper! is an advanced, yet easy to use disk copying program. It can, of course, make a straight copy, or "clone" -- useful when you want to move all your data from one machine to another, or do a simple backup. In moments, you can completely duplicate your boot drive to another drive, partition, or image file.
Clones for safety. To ensure you can safely roll back a system after the unexpected occurs. With a few clicks, you can easily "checkpoint" your system, preserving your computer's critical applications and files while you run on a working, bootable copy. If anything goes wrong, just reboot to the original. When you do, your current Documents, Music, Pictures -- even iSync data -- are available! You can get back to work immediately.

Clones for industry! SuperDuper has enough features to satisfy the advanced user, too. Its simple-but-powerful Copy Script feature allows complete control of exactly what files get copied, ignored, even aliased ("soft linked" for the Unix inclined) from one drive to another.

WHAT'S NEW
Enhancements & Bug Fixes
- Fixes issue with "looping symlinks" in some app frameworks (MDRP, FileMaker Deluxe Pro, iPhoto Library Manager 2, TextMate)