Ask Slashdot: What Touch Screen Support is Available in X?

Gextyr submitted a question regarding something I've always wondered about as well. He asks: "I work at a local computer shop, and was just given permission to put together a Linux box for display and demo purposes. My boss gave me a touch screen for this (the touch matrix is serial controlled) purpose as well. I want to know if there is any touch screen support for Linux, and if so, where can I get mode information about it?"