Short comparison of several agile project management tools. I can't resist to provide the quote :)

Even though it is [TargetProcess] a massive application somehow it feels very intuitive. Reports are easily customizable, processes can be changed to fit your style such as XP or SCRUM. You can comprehensively organize your stories into iterations by dragging and dropping. In-place editing almost everywhere allows for super quick updates. Overall the app seemed extremely configurable yet uncluttered. Also available is a public API, support for Subversion integration and a rich story card board that seems easier to use than Mingle’s.