Kudzu: I have not played with those touch screens in a long time. I almost forgot that I had them. I had plans to build a workstation using a large LCD panel, SBC and the touch screen. Unfortunately the LCD panel deal fell apart. After that I got sidetracked by other projects. Getting sidetracked seems to happen often with me <g>.
I don't think that I have an XP driver for them. I would be interested one if you have it. Please send me email at smoke_liberator at yahoo dot com.
Chicago773: Adding a touchscreen (TS) to a 21" monitor is possible. There are a few areas of caution. One is to make sure that the curvature of the TS matches that of you monitor (i.e. regular (double) curved, Trinitron (single curved) or flat). Another is to make sure that you have the room inside your monitor to mount a TS. Most importantly, be sure to research the safety procedures necessary to work on the inside of monitors. Be sure to do things like discharge the CRT and have the tube properly supported when you work on it. Some of the TS manufactures have good installation instructions. I wouldn't advise you to open the monitor case until you've read them.
There are several TS technologies that will allow you to use your finger. One of the TS manufacturers had a PDF document that explained the different technologies and their strengths and weaknesses. Try poking around here to find it.
I'm not sure if it is worth the effort to retrofit a TS to an existing monitor. TS monitors are common on eBay for reasonable money. Then again, if you are a cheap bastard like me you might want to give it a try <g>. Watch eBay, I've seen used panels go for cheap.
Electronics run on smoke, if you let the smoke out they won't work