Remember the Milk is a task and time management application. It allows users to create task lists and set reminders that will alert their cell phone by email, SMS or IM messages. You can see your tasks by your location and share your tasks and reminders with others.
This would be useful in order to keep track of grocery lists and appointments. You could plan the most efficient route to get your tasks done by looking at them by location. You would be able to set reminders to pick up items on your way home minimizing trips to the store.

Locate your tasks.Use the map to see where your tasks are located in the real world. See what's nearby or on your way, and plan the best way to get things done.
Add tasks wherever you are.Adding tasks is as simple as firing off an email (even from your phone). See an important date on the web? Add it to your list with Quick Add.
Organize the way you want to.Are you a list lover? Create as many lists as you need. Into tagging? Use the task cloud to easily see what you have to do. Want to store notes along with your tasks? You can do that too.