Scientific Linux 6 is built from RHEL 6 source code, and has been out for months. Cost: free (almost -- there's time to download and the cost of the Internet connection).
I gather CentOS 6 will actually be available in the next week or two.
Both are better options to Fedora, as RHEL 6 includes functional elements from Fedora 12, 13, and 14.
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