Here's my entry. I tried to bring minimalistic Japanese feel to it (as you know Ruby is from Japan) :) It's lightweight and everything is text so, you can make the changes if you wish.
Also the top which now says "Ruby, programmer's best friend" can be replaced with navigation if you at some point decide extend the site.
I deployed also to http://karrisaarinen.com/rubyc/ so its easy to view and share (the banner in the upper corner is not there to stay, and not included in the design or on this repo)
Kisko Labs http://kiskolabs.com
some cleanup and favicon
fixed the background image in firefoxes
My favorite by far!
Nice one, clearly has all information needed, plus the only one who thought of anchor links
Simplicity makes things beautiful!