A couple of years ago, the people who are continually stretching the edge of the Internet envelope began talking about Web 2.0. Wikipedia, the user-created encyclopedia, defines Web 2.0 as "a term often applied to a perceived ongoing transition of the World Wide Web from a collection of Web sites to a full-fledged computing platform serving Web applications to end users. Ultimately Web 2.0 services are expected to replace desktop computing applications for many purposes."
That's happening.