Well look no more! The perfect adapter is here!
http://image.lik-sang.com/images//large/xbox-magicbox.jpg
It let’s you use your PS1/2, Dreamcast, and most importantly, you Saturn pads on the XBox.
It even has a communicator port built in for Xbox Live.
http://image.lik-sang.com/images//large/xbox-magicbox2.jpg
Yes I know it has been out for a while but I just now discovered it had that port which made it a must buy for me, now the SF pads go back in their box and the Saturn pad gets the much needed attention it deserves