September 28th. (this week) is the day that registration opens for Jennifer Wagner's Technospud Project The Pumpkin Seed Count. Without much preparation on your part, your students can gain many skills and develop concepts while participating in a project with many other students from all over the world. The project is for Grades K-3. You can find a "sneak peek" at the project at http://www.technospudprojects.com/Projects/ps2007/ps2007home.htm
Jennifer does a fantastic job of providing activities to accompany this project and your students can become a part of a world-wide community of learners. If you have never participated in an online collaborative project, this is an excellent place to start.