Taskpool is a feature where you can post tasks that need to be done, together with suggestions for who might be best suited to take a look at them. This can be a great way to keep a team on target, or a clearinghouse for low-priority tasks that people can pick up if and when they have time.

In the Taskpool pane there is a list of tags the left sidebar where you can find all of the pooled tasks for that tag, or add one to the pool.

When creating a pooled task you can flag a person by clicking "Add a suggestion" and selecting them from the drop-down menu. This will bring the task to their attention. You can see the tasks in which you've been flagged in the "My tasks" section.