Stove/Oven:
1) You put your Lasagna in the oven in the morning. The oven keeps it cold through out the day. When you start to head home for work, you click the app to start dinner. The oven switches from cooling to baking. When you walk in the door at home, dinner is ready to come out of the oven.
2) You get a notification on your phone that one of the top heating elements has failed. It knows this from the monitored resistance on that heating element going open.
3) Push notification lets you know the oven has finished preheating. Or that a timer has completed.
4) Notification that you left the stove/oven on, when it doesn't sense anything on the cook top or in the oven.
5) Setup a complex cooking routine. Oven bakes at 175 for 4 hours, then switches to 400 for 10 minutes, then turns off.

Dryer:
1) Notify you when the dryer has stopped.
2) Notify you when the lint trap hasn't been cleaned out yet.
3) Start the dryer for 5 minutes in the morning, before you get out of your warm bed.
4) Notify you when trouble: drum not rotating, heating element out, etc.

Fridge:
1) Notify you if the door is left open a certain amount of time.
2) Keep an inventory list.
3) Monitor the temperature in the freezer and fridge (and even certain sections that have zone controls). And get alerts.