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Sorry for the instability of the site over the last few days. This is because the site software is undergoing some rather serious changes, some of which will mean that the site runs a bit funnily. After a while the site should be getting faster, though.
One of the great advantages of running a site that isn't at all commercial and is little more than a hobby is that you can play around with the live site without getting into trouble :)
Red Hat Certified Technician & Engineer (RHCT and RHCE) Training Guide and Administrator's Reference