I would suggest, if you are so inclined, to try to learn the concepts behind programming languages. Once you understand this, learning a new language is mostly buying a good reference manual to figure out the syntax for what you are trying to do! This won't make you an expert on any one language, mind you, but will allow you to pick up a new language much quicker, and allow you to evaluate the strengths/weaknesses of using ****** language for any given task. Another advantage of this approach is that you aren't tied to <insert currently popular language here>.

If you aren't too interested in the theoretical stuff, and you don't know C/C++, those are a good place to start since they are quite widely used.