Event though it's young and in beta, this tool is incredible. The backend integration is flawless and admin tool design is cleancut and very functional. There's a great blend between an iconic and text button approach.
File management is fantastic. You can add files with new tasks, after the fact or add files separately altogether, and additionally can be secured to a specific user. Groups management is simple and slightly cumbersome but functions well right out of the box.
I'd like to see a little better front-end systems integration and management or ability to customize its sizing. Additionally workflow management would be useful, requiring that task contributors, etc. require their feedback or submissions be approved by an admin or Project Manager.
Another benefit would be templated projects - allowing users to create new projects with basic or templated tasks inserted (like a drop down menu); even more helpful would be allowing a finished projects tasks to be set as a standard template.
One final thing I'd like to see: integration with a billing/management system. Professional users could use this tool as a Professional Services Proj Mgmt tool. The front-end could help keep customers updated as to their project status; and billable items could be setup with tasks, i.e. billing could occur at 30% completed, 50%, completed, 100, etc.
Otherwise, this tool is incredibly useful for anything anyone has in mind.