Getting Things Done is about being more productive. The system works like this.
1. You take stuff and put it in the inbox.
2. Empty the inbox and decide if you can take action on it.
3. If no, you trash it, file it for reference, or add it to a someday/maybe list.
4. If yes, decide what the next action is.
5. If it is a project, add it to the projects list and your project plans.
6. If it will take less then two minutes, do it.
7. If it will take more then two minutes, delegate it or defer it.
8. When you defer it, you add it to your calendar or next actions list.
For more information see Merlin Mann’s post on the system.

There are many ways that you can implement this system. Here is how I did it.

1. I have an physical inbox at my house, I use index cards to add ideas to my inbox.
2. I use Backpack for my someday/maybe list and next actions list.
3. I use Mori for project planning and project lists.
4. I use file folders for my reference system.
5. I use a HIpsterPDA at school for homework.

Thats about it. I encourage all of you to go buy this book and start doing what it says.