DEI sells a piece called the 530t, which will allow you to turn all your windows to one-touch up and down. Furthermore, if connected to an alarm, you can roll down the windows using the remote and program them to roll up with the alarm arming.
To do all windows you will need 2 of these bad boys. The bad news is that they run about $100 a piece.
I work at a stereo shop if you're interested, and we have a very nice UPS account.