Cost: Free version and $.99 version
Mobile devices provide lots of different apps and methods for keeping track of what you need to do. To do list apps, scheduling apps, calendar apps, note taking apps are all possible options for making sure life is on track. But, I'd suggest that the simple and free, or low-cost, IconMemo is a good app to use when you want very quick in-your-face access to your lists of errands, projects, to dos.
Take a look at the video below to see how it works.
As the video shows, the idea of IconMemo is that users put notes on their device home screens. The notes can be edited at any time and it's easy to change the look and feel. Teens who simply want to turn on their device and see what's on their agenda for the day or what projects they need to finish will find IconMemo perfect for that. Library staff that want to see what activities are coming up with the tap of an on button, will find IconMemo a good tool for that.
Try out the free version and see what you think and then maybe you'll splurge on the $.99 version which provides more options and features.