TMDtouch of Shenzhen, China has released Zorro Macsk, an external multi-touch overlay for Apple's iMac line. Unlike similar hardware from TrollTouch, the Zorro Macsk supports gestures and multiple points of contact. Engadget went hands-on with it, and posted mostly positive impressions.
What's cool is that there's no software to install. To gets started, simply affix it to the front of the iMac and connect it to a USB port (all the iMac's ports remain accessible). From there, wait about 15 seconds and begin. It even ships with a capacitive stylus, which I assume you can share with your iOS devices.
