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I've just run a successful install test on Fedora Core 5, so it is now an officially supported Operating System. All of the usual Early Adopter caveats and warnings apply to this platform as all of the others, only moreso. Please let me know of any problems you run into. I don't expect major issues, as it is very similar to Fedora Core 4, but it is much less tested, so things are probably still a bit quirky.
Currently, only the i386 architecture is supported. x86_64 is building now and will be available in a day or so.