Adobe Kuler is a brilliant colour theory/management tool that is available online for free. You can create your own colour themes or download and use ones that others have created. It really is a great system and once you know the foundations of colour theory, will make your job of selecting colour that much easier.
As I will explain in the video, it is much easier if you create an account with Kuler so you can export your colours out and then import them into Photoshop, Illustrator or InDesign.
There is a brief video below explaining how we use Adobe Kuler and a second video from Adobe.
How we can use Adobe Kuler to simply the colour theory in our projects.