One question my students always have is, "what is a concussion?" and "why do they have to stay awake?" after experiencing one. Over the past couple years, I have found these resources.
Last year, Dr. Sanjay Gupta of CNN interviewed the same researcher and had a two-part story about concussions and traumatic brain injury. These links have both text-based and video-based stories.
Part 2: http://www.cnn.com/video/#/video/health/2009/01/29/am.gupta.athletes.concussions.cnn?iref=videosearch
From the Neuroscience for Kids website:
This link has some good, basic information about concussions:
This past weekend, 60 Minutes aired an episode that dealt with concussions and traumatic brain injuries that athletes suffer. A preview to that story can be found here: http://www.cbs.com/primetime/60_minutes/video/?pid=JTx0jMslQp27eXB8GAqp8_Bm761b4H75