They always say that to be a good programmer, you have to learn a new programming language every year. I am still finding my way in the Ruby world, but for people who are looking for the next challenge, I can recommend “Learn Python The Hard way”, a free e-book for people who want to learn Python.
It is really, really(!) basic but I found it useful to get the syntax in my fingers without having to think too much about more complex programming problems.