Sometimes you feel that the geek inside you is about to explode , this happened to me when I went to buy a new toy to my daughter from the toy store and seen the RC Cars.
I found cheap remote controlled cars for less than 100 LE ( < 15$ )
The toy cars are remotely controlled using Radio frequency, they are called RC Cars for (Radio Controlled Cars)
Once I seen the remote control, I though immediately if it is possible to connect that remote to my PC and control the car using my keyboard !!! why do that ... I don't know but read the article from the beginning again and you will understand.
So, I did a quick search and I found other geeks thinking in the same line, this post (http://www.hackaday.com/2005/02/01/control-an-r-c-car-from-your-pc/) is what I was looking for and this (http://www.engr.uvic.ca/~sbowman/more-moreBetterCircuitDiagram.gif) is the circuit used to connect the remote to the computer parallel port.
As soon as I do that , will let you all know :)