Basecamp

The book I read to research this post was Sam's Teach Yourself Basecamp In 10 Minutes  which is a very good book which I bought from kindle. I think this book is the only one about Basecamp on the market. Basecamp is a project management cloud computing tool. If you don't know much about project management this program is easier to use than a lot of products and also you don't have to install it on your computer. The company that provides Basecamp used to specialize in web design but decided to specialize in project management and supporting products after the success of Basecamp in 2004. Some of the other products they do are Writeboard for note taking & Campfire for instant messaging. These integrate with Basecamp. It doesn't have a feature for sub projects but you can put a company or client down as a category and put the sub project underneath. You can have several people work on the same project at the same time and they can collaborate online with each other. They have a variety of plans to suit the size of your company. If you are a one man business you might get it free.