SuperDuper Disk Cloner FINALLY available for Leopard
Many users have heard stories, read stories and shared stores of data loss. SuperDuper (along with Carbon Copy Cloner) are two of the best tools available to move (or clone) all data from one drive or partition to another.
Why you ask? For backup purposes, for the need or desire to install a new piece of software (e.g. a sandbox) for testing purposes with the ease to jump back to the old system without loosing a beat.
SuperDuper is shareware and very reasonable cost $25, it is sleek and works well (and now seamlessly with leopard). Mike Bombich has steadily released Carbon Copy Cloner (for free) to do many of the same things- but if you are looking for something inexpensive and easy to work with- look no further!