GLLUG did this a few weeks ago. We didn't have a touch screen, so it's a PII-450 running Ubuntu with X and libgtk2-perl and xscreensaver installed, and a CD-RW and a mouse. The "CDburnbox" thing that I wrote for it apparently works, but I don't know for sure how much use it's getting. It's set up in an Internet cafe in East Lansing right now. The cafe owner likes Linux and lets us meet there every week....