PHP or ROR.
mcav: I like Python. Fast to develop in like Ruby, but also well-suited to many different types of programming tasks.If you're looking to learn a new language, Python's my advice. Ruby is good too, but it seems to be primarily used for web development.If you already know PHP, learn any new language -- be it Python, Ruby, or something else. It's a good investment that will pay off in the long run no matter which language you choose.