For all of those who like both Webots and Ruby, there is great news! I've just finished the first version of webots-ruby bindings, check it out! It turned out to be a pretty simple library, but it's really convenient to have the power of ruby when you just want to rapidly design some controller, without worrying about all that C stuff. Webots of course supports python for this reason, but python is just not the right tool for the job for some of us.