The YouTube video in Occupy Vancouver / TZM on NATIONAL CANADIAN TELEVISION!! (CTV) #occupyeverywhere offers the best explanation of the immediate purpose of the movement that I have heard. During yesterday’s general assembly at Occupy Worcester, I wish I had had these words to offer to explain our goals to this relatively new manifestation of the movement.

I’ll provide a rough transcript of the key part of the interview.

Raise awareness of the fundamental problems that plague our society from the social, economic, and political spheres to all the problems in society, the war, corruption, poverty, environmental destruction. Basically to open it upup a platform for people to discuss the root causes of the problems and pose possible alternatives.
…
At this point it is basically about spreading awareness of these problems. There are many organizations who are going to be in attendance who are posing possible alternatives.

While the occupy movement explicitly doesn’t have one defined solution, it’s basically meant as a platform for other organizations to discuss their possibilities.

The interviewee mentions The Zeitgeist Movement. The link to their web page in the previous sentence will give you a starting point for more research on the movement.