I've blogged before about BirdSleuth, which the Cornell Lab of Ornithology uses to provide teachers with curriculum for citizen science projects.
The program is continuing to expand. As this story describes, a classroom of students from Oregon and a classroom of students from Florida used BirdSleuth to conduct a peer-reviewed bird-watching project. Such collaborations are beginning to rise up across the country, and the goal is now to facilitate similar interactions on an international level.
Considering bird migrations don't pay much attention to state or international boundaries, this is a great way to track birds throughout their range and get children around the world engaged in science. It's also cool because the birds are helping bring people together.
If you are a teacher, this is an exciting time to consider getting involved with BirdSleuth.