Integrate Planner with Sharepoint Teamsites. Planner shows an users overview of all Tasks from all Sharepoint sites.
We have a lot of project running, often in different Sharepoint Sites, but also in several Tasks list, where we need a tool to give a good overview of all Tasks. It both can help the single user, where to focus. But it also can give a good overview of the status on a project. May be you'll suggest Project for running project, but it do not have the features a TeamSite has.