I like the web site the Terry Fox Foundation has put together for their annual school run to raise funds for cancer research. It lets people donate on-line, of course. Much more interesting is that it lets kids collect and create their own content -- photos and videos -- and post them on their own page, along with a graph showing how close to reaching their fund-raising goal they are.
My son Marc got right into making videos for it. For the Foundation, it gets kids thinking and talking about Terry Fox and the importance of cancer research. For the kids, it gets them producing content for the web. The future belongs to those who produce content. (Those of us who produce the technology will be like the guys today who keep the mainframes running.)
Shameless commercial: You can contribute to cancer research by supporting Marc's run here.