Fedora 18 ARM is officially available with pre-built images for the Versatile Express (QEMU), Trimslice (Tegra), Pandaboard (OMAP4), GuruPlug (Kirkwood), and Beagleboard (OMAP3). It's also easy to load up Fedora 18 on Calxeda's HighBank EnergyCore and other select ARM systems. With the popular Raspberry Pi being an ARMv6 product and not ARMv7, there is no official image available of Fedora but some remixes are offered independently.
Fedora 18 ARM images can be found here. The Fedora 18 ARM release announcement is hosted on their Wiki.