WorkFront is a comprehensive solution for agile marketing project marketing. Formerly known as AtTask, the solution provide marketers with project management either by waterfall method or agile. Check out some of the videos from the WorkFront marketing team:
WorkFront Agile Marketing Video
Agile marketing case study - Advance Auto Parts
I've not used WorkFront, but I believe I've previously used AtTask at another company, a few years ago. It looks as if the project has come along way.