Your Android can call people, remind you of appointments, and give directions to places you need to go. So why isn't there a to-do manager that takes advantage of those powers? Todo Q is just such a beast. It's smart about connecting your Android's utilities to your tasks.
The basic view of your tasks in Todo Q isn't all that complex, or different from other apps. It's creating or editing a task in which you'll see the convenience of Todo Q.
By adding an address, you can quickly map or use Google's turn-by-turn navigation to reach it later. Choosing a calendar automatically pipes your dated todo into a Google Calendar, and adding contacts from your phone makes it easy to call any of them from the task when you're looking at it. In other words, it's the kind of thing Google should think about having in the Android itself — perhaps if it builds out its Tasks app.
Todo Q is a $1.98 purchase in the Android Market.