The Fedora Project released Fedora 7, which is a milestone for Fedora because it now includes official LiveCDs with GUI installers, similar Ubuntu and PCLinuxOS. There are four Live images total, two i686 LiveCDs, and two x86-64 LiveDVDs, available in either Gnome or KDE flavors. The x86-64 version is only available in DVD format because it includes additional multilib packages which push it over the 700 MB CD size of the i686 version. A script to install the Live ISOs to a USB drive is also included.
Previously there was only one official LiveCD available for Fedora Core 6 i386 computers, released long after the install media came out. Other Live media for FC6 was available from the Fedora Unity project, but none of these were easily installed to a hard drive.
The Fedora release includes several live ISO images in addition to the traditional installation images. These ISO images are bootable, and you can burn them to media and use them to try out Fedora. They also include a feature that allows you to install the live image content to your hard drive for persistence and higher performance.