Manage collaborative projects using the free tool Trello.com

Trello.com is a free, Web-based project management and collaboration software tool that is relatively easy to learn and use.

After you create a new Trello account (or login using an existing Gmail account), you have the ability to work with the basic project management units, called Boards, Lists and Cards:

• Board - a Board represents a project or work in process. Boards contain Lists.
• Lists - a List contains a collection of vertically-arranged Cards. Lists are generally used to represent workflow.
• Cards - a Card is the basic unit of a Board and can be used to represent a task. You can assign other Trello users to a Card, create tasks checklists, label them, attach files to them and gather comments and conversations on them. 

Moving Cards around in the Trello environment is easy: simply drag the Card from one List to another.  You can create as many Boards, Lists and Cards as you want or need.

Try it for yourself at Trello.com.  Once you've created an account and are logged in, click the "i" symbol in the upper-left of the page to access the Help and Guide pages.