'Coworking' is a term used to describe an informal workspace shared by entrepreneurs and telecommuting professionals. Members of a coworking space rent a dedicated file cabinet, and share an Internet access point and desk with other members. Those who use coworking spaces save money over renting conventional office space, and the casual environments facilitate the type of dynamic brainstorming among members often unrealized with conventional networking. The workstyle option has evolved into a movement of sorts, with approximately 200 such coworking centers open across the nation.
Affinity Lab in Adams Morgan has been open since 2001, and to the best of my knowledge is the only facility of its type in the D.C. metropolitan area. As coworking space is to be a central feature of Ignition Cyber Club, I've provided a link to a Washington Post article on Affinity Lab that gives a solid representation of the concept.