Redminder is a simply and free app for your Windows Phone to help remind you when your Redbox or Blockbuster rental is due. Interface is simple. The main page lists all your reminders and to set a reminder, just tap the "Add Alarm" switch.
The due date is set automatically for 24 hours (can be modified) and the name of the rental can be customized. Once you save the reminder, a Live Tile is created for your start screen that will display the title of the rental and expand to show your return date/time.
You can turn this feature off in the settings if you don't need the Live Tile. Redminder is a Mango App and supports fast resume and multiple live tile support. So, if you have five rentals you can have five Live Tile reminders.
Redminder comes in two varieties. A free, ad supported version and an ad-free, $.99 version. You can find the free version of Redminder here and the paid version here at the Windows Phone Marketplace.