Canson demonstrated PaperShow which is a presentation tool that uses a paper/pen combination that controls your presentation and allows you to annotate in real time.
The product includes specially marked paper and a pen with a camera. You print out your presentation onto the special paper and annotate it in real time with the pen. The pen follows the microscopic dots that are on the paper to translate your markings onto the screen. Besides drawing lines, there are different colors, shapes and functions. The starter package is $199 which includes the pen, bluetooth adapter, paper and pad.
Macworld hosted a DEMO presentation showing off 6 of the "best of" products being shown at the expo.