What's a 21st Century classroom look like?

    I keep hearing we need to be technology literate to keep
    our students interested in today world. Can you help me out with this idea? I often use
    PowerPoint with imbedded videos. What else is there? I
    have access to other software, but do not really see their
    advantage. If I were concerned with an online class,
    maybe, but why use anything other than PowerPoint in the
    traditional classroom?

    What skills do you think I need as a high school science
    teacher to create a 20th century classroom?