Action Lists (app store link) is a new task manager for the iPhone and iPod Touch based on the Getting Things Done (GTD) system. Action Lists harnesses the power of the GTD system with an easy to use interface that makes it fast to access the information you need when you need it.
Action Lists is an app that was designed to be used on the go. Lots of little details help users "get things done." For example, the tab bar at the bottom of the screen contains all of your essential GTD lists and makes it convenient to access them without having to navigate back to a "root" screen to switch lists. Also, the context lists (or "action lists") filter the tasks that are displayed so that only tasks with a status of "Next Action" appear. This keeps you from staring at a host of Someday/Maybe tasks when you're hunting for something to work on in the five minutes before a meeting.
Action Lists has all the features you'd expect from a fully featured todo app including support for due dates, future tasks (set through a task's start date), repeating tasks, and task notes, but it's the details that make this an app worth using. Scheduling repeating tasks is flexible: tasks can be set to repeat every Monday, the last Tuesday of every month, or every three months. Never forget trash day or that furnace filter again! Of special note is the way that Action Lists handles future tasks. By default, a task is hidden if it has a start date in the future. That's great until the start date is reached. Most todo apps would silently slip the task into the appropriate list when it's due to be started, but then the task is easy to miss. Action Lists allows the user to specify that tasks be placed in the inbox when their start date is reached. This increases the visibility of tasks that are due to be started, and is consistent with the "tickler file" described in Getting Things Done.
Having your tasks always with you on your iPhone is great, but sometimes its nice to enter your tasks using a full keyboard and a computer. Since Action Lists will synchronize over the air with your Toodledo account, that's not a problem. (You can register for a free Toodledo account at http://www.toodledo.com.) Through Toodledo, the tasks that you enter into Action Lists can be viewed, modified, completed and shared with others. And tasks that are entered into Toodledo through it's web interface (or through its connection with Jott) can be synchronized back to Action Lists so that they are always at your fingertips, whether in a business meeting with an Internet connection, or on a flight with your device in Airplane Mode.
All in all, Action lists is a great app if Getting Things Done is your todo system of choice. Action Lists is available for download on the App Store at a price of $9.99. If you would like to try before you buy, there's also a free version called Action Lists Lite (app store link). Action Lists Lite has all the features of the full version, but is limited to only 15 tasks.
For full details and support, visit Daze End Software and post on the forums. Or just post in this thread, I'll try to monitor it.