OS-independent full system backup / disk image solution as a live cd with a graphical interface under the open source GPL license. Really easy to use, straight forward, to the point that I'd recommend it to my mother (if she spoke English, that is). There are a lot of other disk image solutions out there. However, most of them are limited to either one OS and/or are expensive. For creating an emergency backup (for example, when planning to upgrade your OS or trying something you aren't sure will work) this worked great for me with Win 7 and Linux systems.
http://redobackup.org/
http://redobackup.org/