[ww520]

Cars. I'd like to turn on the AC afar remotely 15 minutes or half hour before get into the car on a hot day, or heat it up remotely on a freezing day. Some might already be doing it (Tesla).

Watering system. It can look up the season/weather and adjust the amount of water to sprinkle.

Battery. So that it can send out a signal when it's low on power. I know it's probably impractical but we are talking about ideas for the future.

Credit card/smart cash card. Yes, I want to look up balance/transactions, transfer money, and be alerted on charges on the card itself with the screen and network on it.

[viraptor]

Some cars already use the electric heating automatically when you unlock the doors remotely. It just blasts hot air and heats up the seat quickly. I think the latest prius does it, but I may be wrong here.

[ww520]

But key fob needs to be nearby and almost getting into the car. I was thinking doing it in the office remotely 5 to 10 minutes before leaving. Cooling a car takes some times.

[byoung2]

My brother's car (Cadillac Escalade) has remote starting through an Android app, and you can adjust the climate control through the app as well.

[stephenc_c_]

Many cars sold in markets with colder climates have auxillary heating, which lets you start heating the car from the key fob. I'm not sure how much more convenient doing this on your phone would be.

[maxerickson]

OnStar has an app:

http://www.chevrolet.com/onstar-remotelink.html

Heating/Cooling isn't discussed there, but I guess it's easy enough to leave the environment controls where you want them when the vehicle starts.