Gems are reusable libraries for Ruby projects. Here you'll we create our your very own ruby gem! As someone pointed out, you can call yourself on a resume: "Gem creator and maintainer". Possibly your twitter status: "about-jwo core committer"
Ruby Off Rails is dedicated to accelerating the mastering of Ruby and increasing developer happiness everywhere.
In my software training, I see two distinct sets of programmers: those who know Ruby, and those who haven’t learned it yet. People who learn Ruby have an easier time understanding Rails, gems, and what magic voodoo is going on. And most importantly, they can cast wicked voodoo themselves.