iOOS: Do is an app that's designed to not only manage your tasks but the tasks of an entire team. Everyone working on a given project shares tasks with one another, keeping the entire team up to date on the project's status.
Do is very straightforward and seems like a pretty simple, well-designed task management app -- and it is -- but it really flourishes when you use it with other people. You can create an unlimited number of projects and tasks, then assign those tasks to users (or tasks can be assigned to you). Comments can be made on specific tasks, you can add notes, and real-time alerts will let you know when a task has been completed. When you're not on your iPhone, you can use the Do.com web site to manage your tasks from a computer or other mobile device. There isn't a lot to learn to use Do -- it just manages team tasks very well.
Do's functionality is similar to Orchestra, our favourite to-do app. Both are free, but Orchestra offers a greater number of features (like voice recognition). Do is an app for those of you who are looking for a very simple interface. This isn't to say Orchestra's interface isn't simple, but Do is about as straightforward as it gets. You won't have to learn how to use it. It also allows you to sign in with your Google or Salesforce account, rather than creating a new account (although you can do that, too), and has a special section for taking notes should you need to jot down any quick information.
If you want to check out Do, it's completely free and available right now in the iTunes App Store.
Do (Free) [iTunes App Store]