One of the advantages of Norton Ghost 2003 and Clonezilla is that they can run independently of the disk being cloned. I use a USB that boots to DOS for Ghost and Linux for Clonezilla. If there are other good choices, perhaps readers will add a further reply.
As an aside, and a tip of the hat, the Parted Magic distribution is a wonderful toolbox that includes both GParted and Clonezilla. If you're not already using it for partitioning, check it out.
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