RedHat has posted a HowTo on installing Fedora Core 4 on Apple's mini.
The Apple® Mac® mini is Apple's latest offer in the arena of groovy computing. It also serves a Linux geek's bliss: it sports an affordable PowerPC system in a small, quiet, stackable, and attractive case.
Models available from Apple currently ship either with the 1.25GHz or 1.42GHz PowerPC G4 processor and with 40GB or 80GB of disk space by default. It comes with a Radeon 9200 32MB video card and a standard of 256MB of RAM (which can be upgraded). Options for Bluetooth® and Airport® Extreme exist, however the latter will not work on Linux. Note that it only has one memory slot, so upgrading the memory is recommended at purchase time.
Getting your feet wet
Unpacking the Mac mini was a rather exciting process. Looking at the form factor, it could sit almost anywhere! The kit includes a DVI to VGA adapter, which I plugged in, to attach the monitor to. The Mac mini, not coming with any display or input devices, relies entirely on "bring your own" hardware. I attached a 15" CRT and a standard Apple USB keyboard and optical mouse.
Turning it on, you get automatically booted into Mac OS X. Don't get too used to it just yet, because to get Fedora on your Mac mini, the disk is going to have to be repartitioned. From a Terminal, you can find the default disk usage and partition format (only one large partition) with the df -h command.