Apple's Reminders app, introduced in iOS 5, works perfectly well at notifying you according to your time- or location-based criteria. But a new app called Checkmark (99 cents for a limited time) gives you location-based reminders using your GPS and important locations you enter, and with a great-looking interface that's easy to navigate.
You start by adding locations important to you such as Home, Work, the Gym, and a friend's house you often visit. You can locate yourself via GPS, but you also can search for an address on a map and add a location pin that way. The next step is creating reminders based on your locations.… Read more