Red Hat Linux this week shipped Fedora Core 4, its desktop Linux distribution for enthusiasts and other individuals. Fedora Core 4 includes the GNOME 2.1 desktop environment, a beta version of the OpenOffice 2.0 office productivity suite, and the Xen virtualization technology, which lets you run multiple OSs on the same PC. Fedora Core 4 is available for x86 (32-bit), x64 (64-bit) and Power PC-based computers. And, best of all, it's completely free.