linux.oreillynet.com: An Introduction to Ruby from way back in October of last year.
Should I care about Ruby? It's gotten enough attention to become part of MacOS X in Jaguar, and I keep hearing about it here and there. When I read "the OOP power of Smalltalk with the utility of Perl and the power of Python," I get excited, but when I read it's a "better Perl than Perl," I cringe.
I guess I'll enqueue it to the list of things I want to learn. (Sorry Ruby ;-))