Remember the Milk is one of the most popular task management/to-do list services on the Web. Although, there is no official app for RTM on Windows Phone 7, WinMilk and Get My Tasks help you work on your RTM account on the move.
The app caches data locally so you can see your tasks even if you do not currently have a network connection. WinMilk is available for free in the Windows Phone 7 Marketplace.
Get My Tasks allows you to download your incomplete RTM tasks and arrange into your lists, sorted and color coded to allow you to quickly identify your next task that is due. However, currently you cannot add a task from within the app, although you can postpone or complete your tasks from within the application.
Get My Tasks will save your data locally so you can review your tasks when offline. Get My Tasks is also available for free in the Windows Phone 7 Marketplace.