“The Collect Cincinnati,” is a collaborative effort to create art as a community (collectively) from the collection of discarded objects.

Berkeley Open Infrastructure for Network Computing.  Allow your computer’s idle time to collaborate with other computer to help cure diseases, study global warming, search deep space, etc.

Go here to see the BBC Climate Change Experiment, how you can be a part of it and what the results are so far.

The current giant in collaborative knowledge (but see Make Room Wikipedia for the future).  Word of advice for students: use Wikipedia, but don’t cite it; cite only refereed sources.

An attempt to network knowledge which balances the assumed liberal bias of Google and Wikipedia.

A network of knowledge to promote the ideals of creationism.