I was thinking of making a page on this wiki to point out some of the interesting open collaborative design projects. Then I discovered the Advanced Civilization wiki which has gone far beyond what I was thinking about. Check out the Advanced Civilization wiki at [http://www.adciv.org/Main_Page], then think about where you can contribute.
The majority of people in the world can not afford to participate in the modern economy and it is going to get worse as automation increases. The answer is to create a new economic system that does not require money. By posting your knowledge on the web with an open source or creative commons license you are helping to create this new economy. By using wikis and other social media, your knowledge and ideas can be refined and built upon by collaborating with others.