All systems: Fedora 13, the latest version of the Linux desktop code-named Goddard, is available for testing out on a live CD, a USB stick, or, for the brave, hard drive installation. Automatic printer drivers, better graphics support, and more is included.
Most of Fedora 13 consists of refinements in various packages, including the desktop, application installer and other aspects familiar to regular users. This release does include some new steps, however, like automatic installation of printer drivers for supported hardware upon plugging in. NVIDIA graphics chips get better — and in some cases, open-source — driver support, and easier webcam utilisation. Software like Firefox also gets new and better packaging, and, well, the rest you'll have to see for yourself.
Fedora 13 is a free download that should run on most hardware. If you're keen on testing it through a USB stick, here are Fedora's instructions on doing so.