SUSE LINUX http://www.suse.com/

SUSE LINUX is a popular distribution based out of Germany. The latest version is available as a personal edition ISO download, and they also offer a "live evaluation" version that runs completely off a CD. You can also boot from the ftp install ISO image to install from a remote ftp server.

NOTE: Yes, the name of the distribution really is in all caps now. No, we don't know why. Before the capitalization it was "SuSE".