www.RubyOnRails.org - Ruby is a next-gen programming language that is sure to take off quickly - being able to write an entire blog engine in 15 minutes? Yeah, I would think so.
RubyBoards.com - value?
-Matt
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It's a niche market, but being a Ruby programmer myself it has certain value. Without any sort of development, I'd appraise it at $70-$90 on the current market (due to the topic being timely). That's an end-user price, because otherwise it's very limited in its uses.
Developed, however--that's a completely different story.