Rails on Fedora Core 6
There’s a useful (and concise!) guide to installing Ruby on Rails on Fedora Core 6 over on not404.com. If you’re trying to install Ruby on Rails on a 64-bit version of Fedora Core 6, you’ll want to take a look at this bug report; it includes a patch you’ll need to apply to get RubyGems working.
Hooray for living on the bleeding edge, I suppose.

What’s wrong with doing a yum install ruby*
Ruby is in Fedora 6 extras.
Les
Leslie,
Nothing! I linked to the guide because even though it’s a little more complicated than yum install ruby*, it describes what all the individual pieces are and how they fit together, which is great for a control freak like me!