When I bought my car, one of the first things I did was buy a fancy new Alpine head unit to replace the factory stereo. This gave me the ability to add an XM tuner and an iPod adapter. I ran the iPod cable into the glove compartment, so I could just connect the iPod in there and close the glove box when I hopped in the car.

I've got a reasonably interesting setup of MisterHouse (a nifty Perl-based home automation program) running on a Linux machine upstairs, that does stuff like turn on lights automatically when it's getting dark or when I enter a room, turn lights off when there hasn't been any activity in a room after a predefined time, and so forth. Maybe I'll post more on that later.