Charles Cave has a useful tutorial on how he uses Org mode to implement David Allen's Natural Planning Model. Org mode is a natural way of performing the model's five steps and Cave walks us through how that can be done.
You don't have to be a Getting Things Done believer to make use of Cave's ideas. Mostly it's about using Org templates and tags to capture the information about a project and then track it's progress. If you like Org mode and are interested into integrating it further into your workflow, be sure to give Cave's tutorial a look. There are a lot of good ideas in it.