ShirtPocket releases SuperDuper! a great disk cloner for Mac OS X.
SuperDuper can be used as a flexible disk copying utility, but it goes well beyond mere duplication. Its unique "Safety Clone" feature lets you install potentially risky drivers or system updates without fear of creating an unbootable or unworkable system or losing access to your critical personal data.
I've been beta testing this app almost since the beginning and it has become indispensable to me. Great app, great price, great people... I definitely recommend it!