How can a web developer contribute to Ubuntu?

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http://askubuntu.com – I've done web development for the past ten years, and have used Ubuntu for my operating system for the past five. I feel like my design and development skills could be useful, but don't know how I can help with experience in web development. I'm currently versed in Ruby, PHP, ColdFusion, and Javascript, and I took a Java class in college. I'm also willing to learn a new language, but don't even know where to start as far as what would be most helpful to the Ubuntu community. Are there projects that a web developer could help with in Ubuntu? Or what language should I learn to best help contrib (HowTos)