What-if: This site answers random questions every Tuesday using physics. They have some very artistic representations to go along with their explanations, which you might find amusing. http://what-if.xkcd.com
MinutePhysics: Great, short videos on physics concepts. Here's an example of one I think the 9th grade boys in my class would love (anything that "explodes" is cool):
MinuteEarth: Great, short videos about Earth.
Addition 8/9---Institute for Global Environmental Strategies: (From their site) The courses deepen teachers’ content knowledge within an inquiry environment through reflection, analysis and self-discovery. They familiarize participants with Earth system analyses and provide a suite of techniques that can be employed to facilitate student learning; these include Jigsaw, Problem-Based Learning, and Group Investigation. Each of these methods takes teachers out of the role of “middle man” (i.e., the deliverer of content) and creates a student-centered classroom. http://essea.strategies.org/background.html
It's Okay to be Smart on YouTube: There are soooo many amazing videos on earth, biology, space, and physics. I think you'll especially like this one:
The Scales of the Universe: Scales the big and small in the universe. I've used this one before in my astronomy class, but it's always a good one! http://htwins.net/scale2/
NASA Goddard: Latest in NASA's research into astrophysics, Earth Observing, and Solar Science. I especially like "This World is Black and White" on feedback loops. http://blip.tv/nasa-goddard-tv