Coworking is a movement to create a community of cafe-like collaboration spaces for developers, writers and independents. Pioneered in San Francisco by the Hat Factory (http://hatfactory.net/) and Citizen Space (http://citizenspace.us/), these places provide a casual work environment for web workers, consultants, freelancers and entrepreneurs to work independently, together. (http://www.techvibes.com/blog/camaraderie-in-coworking/)
You are working for yourself, but not by yourself. The aim of coworking spaces is to provide independent workers with the benefits of the social interaction that occurs from working in a typical office. (http://www.techvibes.com/blog/democamp-meets-coffee-shop/)
To get a feel of what coworking is like at The Network Hub: http://www.techvibes.com/blog/coworking-with-coworkers