[leevonk] sent us this quick and dirty home automation set up. Using photo resistors and your computer screen, you can drive as many relays or actuators as you want. [leevonk] is simply using changes in brightness on his computer screen to set off relays. This makes it easy for someone who has no programming knowledge and a tight budget to set up some automation. You could even do remote automation by connecting to your pc via VNC. Be careful taping things to your screen, wouldn’t want to damage it.