TIME Magazine has a story on Wikipedia, the free open-source encyclopedia that anyone can edit. The world’s largest online encyclopedia, controversial Wikipedia has 500,000+ entries in English alone.
The author also discusses wikis a business application:
A wiki is a deceptively simple piece of software (little more than five lines of computer code) that you can download for free and use to make a website that can be edited by anyone you like. Need to solve a thorny business problem overnight and all members of your team are in different time zones? Start a wiki.