I've had acronis on XP for years and absolutely love it. Since going to Vista 64 in dual boot, I've had to upgrade to True Image 11, and Disk Director Suite 10, but they both work like a charm. Have cloned more drives than I can remember, and the only problems encountered was one, and it was a user error
Both offer very intuitive interfaces, and are stable programs.
I don't know if your into tweaking Drive partitions, but if you are, Disk Director is an invaluable and amazing little program as well. I can't live without this program now.