To get from an idea to a finished project, certain people need to do certain things in a certain order. Even if my team consists of me, myself, and I, having a schedule allows you to know what needs to be done by when, and in what order.
Sample schedule File
Commons Schedule (Excel File)
Painless Software Schedules By Joel Spolsky http://www.joelonsoftware.com/articles/fog0000000245.html
Links to Helpful Tips on Project Management in General
Center for Educational Technology Project Management Workshop
Colby Studio PM Implementation