A couple of my favorites are the following:

- Tell you someone is at the door on the remote without disturbing the movie via sound effect, etc.

- Since I am notorious for leaving the garage door open, a message on the TV screen or remote in my bedroom signalling the garage dor is open.

- Providing temperature information outside as well as inside and triggering certain events based on both.

- Feedback that certain systems are stil on (particularly zone 2 applications that can go silent and be completely forgotten).

Hope this helps.
Vincent