From Bruno Di Gleria:
ITMTouchBridge is a touch screen driver for the Macintosh.
It doesn't require an installer: just copy it inside your applications folder and run it. Choose "ITMTouchBridge Help" from the help menu for more details.
ITMTouchBridge has been successfully tested with the Flatron L1730SF LG monitor running on OS X v10.4.11 and v10.5.6 and v10.6.2. It is currently compatible with the ITM touch screen USB controller used by LG and some other manufacturers.