I’ve been playing with Trello for a few months now, and I think its one of my favourite new applications.
Trello is designed to help you organize almost anything, and uses a simple intuative drag and drop interface. It falls into the category of Software as a service (SaaS) since the application and all of the data is stored on the web based server.
Trello allows you to create projects and add people to them so that you can divvy up responsibilities and everyone can be updated on the status of each item.
Trello also has an iPhone app that makes it very easy to access and update your projects.
Give it a whirl and tell me what you think.