Again, wiki does a great job. There is no list of demands and the movement is not uniform. Different people in the movement have different kind of demands. Basically, the way I understand it is that it is the leftist equivalent of tea party movement and both movements are pretty much the same but they just have different idealogical colors.

Personally I sympathize with their demands of reducing the corrupting power of money, i.e., special interests influencing political decision process. There are many people who have realized that the US political system has a systemic bias; since more money almost always implies more chance of victory, it follows that different sections of society have wildly different influencing power when it comes to politics. The end result is that the government becomes a representative of special interests, lobbyists, corporate powers, and the wealthy class rather than all the citizens.