An SMS a few minutes before I enter the car in the morning would ensure warm seats every time.
it'd be wizard to control this with a wireless (wifi) connection - the car's parked in the garage and it transacts with a pc in the house. every night the home pc could download run data for that day. also, the home pc could provide a bit of security by pinging the car pc every few minutes or so: "still there?" "yep!". if the pings stop, the home pc activates cameras somewhere (in the garage? maybe the cabin?).
with the sms connection, it'd also be cool to have it connected to a gps unit, so that if it gets stolen, you can text your car and it will text you back with its current location...