What application would you use if it existed?

My most used application was a to do list.
But then I read this article and it made some excellent psychological points on the negative emotional impact of a never-ending to do list and realized how annoying the to do list is as it is always there reminding me that I will never be caught up.

So I got to thinking- how could I function and not use the unending to do list and looked through the app store.

After coming up with nothing useful I decided this is what I would love to have: An application that puts a time to complete a task on a calendar so I need not be concerned with it until the designated time. This way once I have finished my daily itinerary I can bask in the glow of a productive day.

- A day-planner type application that looks like a day planner.

- When you add a task it has you assign it to a time and date.

- Each day an email of your daily itinerary arrives in your inbox.

- Text reminders during day for very important tasks.

- Place for notes such as phone numbers etc to complete the task from where ever I happen to be via phone.

My question to you all- is there a practical application you wish would be invented that would improve your life?
If so what would it be and what features would it have?

Let your imaginations go wild!

Lurve to the most practical clever answers that do not venture into fantasy (the latter of which will be read with amusement but not lurved)