Groups can be formed in you classroom, across schools or worldwide.
Looking to set up an international collaboration or competition visit
http://www.classroom20.com/

Call to Action
This is a place to collaborate and share ideas, links and resources, so go ahead and use what you find under creative commons you can join to share your ideas and opinions

Pizza Project
Excellent business plan and ideas that all students can understand. Use this engaging project as a theme for your course, there are tonnes of learning opportunities and lessons that you can incorporate for your local curriculum and different student profiles. If you don't have time then this can be a useful entrepreneurship unit.

http://www.millersville.edu/~mucee/techconnect/tc/pizza.html#time_chart


Pringles Project
A great idea to have student work on packaging and connect with another group of students somewhere else in the world.
http://connections.smsd.org/robots/pringles%20project.htm