TED Talks has been a Resource I Like/Use when I was a classroom teacher, and now as an administrator more than ever. We've shown TED Talks in staff meetings, grade level meetings, during lunch with the upper graders in the MPR, and I even post them on our school website. Check out TED.com and see a few of my favorites below.
Stanley McChrystal (former Army General in Iraq) gave an inspiring Leadership talk in March 2011, you can watch/show the talk here.
Bobby McFerrin gave an inspiring talk for the musically inclined, or those that would like to be more creative in the arts. Watch the talk here.
Saul Griffith talks about Tapping the Wind for energy here.