Many of the project management application are based on either a waterfall approach to planning or on an extended form of To DO list.
Here is an interesting web application that I will try: VersionOne.  Here is a product overview from their website.

Product Overview

All of VersionOne’s tools are designed from the ground up to support today’s leading edge agile software development methodologies such as Scrum, XP, Lean Kanban and Hybrid. From small teams to distributed enterprises, VersionOne’s agile project management tool helps companies scale agile faster, easier, and smarter.


I am very curious about this one!!