I've finally connected a relay to my parallel port! I got the circuit design from here. I can use the relay to control almost anything in my house. I have combined it with my gesture recognizer to allow me to control things with a laser pointer! Its fun. Using this with motion detection could also be a good idea. The computer would turn on lights whenever it senses motion. Anyway, check out the video above. I'm controling a table lamp with my computer.
I guess I could've connected upto eight relays, but I wanted to keep it simple. Besides, I might end up using a bluetooth relay board later on (or maybe even X10). :)