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This is an interesting article on communities and learning.

Remake of Star Wars (A New Hope) created by fans. Each fan creates a 15 second clip (however they want) and they're put together into a movie. Interesting example of massive internet collaboration.

"business-to-consumer and business-to-business commerce conducted by way of the Internet or other electronic networks. E-commerce originated in a standard for the exchange of documents during the 1948 - 49 Berlin blockade and airlift. Various industries elaborated upon the system until the first general standard was published in 1975. The electronic data interchange (EDI) standard is unambiguous, independent of any particular machine, and flexible enough to handle most simple electronic transactions. In addition to standard forms for business-to-business transactions, e-commerce encompasses much wider activity - for example, the deployment of secure private networks (intranets) for sharing information within a company, as well as selective extensions of a company's intranet to collaborating business networks (extranets). A new form of cooperation known as a virtual company, actually a network of firms, each performing some of the processes needed to manufacture a product or deliver a service, has flourished"

Here is Answer.com information on E-commerce.