The task-management market is growing, in part because users need to coordinate with teams via mobile. In this case, heavier-weight solutions like Yammer, IBM Connections, Podio, and other work media collaboration platforms don’t always suffice. But the demand for digital to-do lists that can be shared across project teams is increasing, and there are a range of products to fill the void. For example, team-task-management tools like Do, Trello, and Asana are taking the lead. There are also a host of immature products such as those from Producteev and Astrid that could grow into something substantial. In 2013, expect to see more innovation and new entrants into this crowded and hot marketplace.