There where also some touchscreens near the place I wanted to use my arduino, they usesd RS232 cable, remebered it was very expensive, but now we have the USB1.1 -> Cat5 extendere solution, and we can also use a mouse and keyboard for debugging.
Hope I can simply plug in my Arduino and make it work.
Thank you for the reply kg4wsv.
So, basicly you say, you made your own RS232 cable (sorry, my naming convention isn't soo good, but I asume you know what I mean) buy taking some piece off Cat5cable, and solder your own connetors, and it works? That trick is great to know 
But I serious wonder about the shielding problem you will have, than again, as you said with low data-rates it should not realy mather. Think I could try it with some trial-and-error, hehe.. low budget rules 
Once again, thank you for your time, I am just a beginner to this great world off electronics.