When researching available technologies for touch input a couple of months ago, I came across this Israeli tech company called N-trig that has developed a touch input tech suitable for laptops, LCD screens etc. It offers multi-touch input AND stylus input in the same device on top of the LCD display.
They have a bunch of videos on YouTube, and there is a joint one with Dell that seemed to suggest Dell would be shipping this in their Laptops toon. I suspect this has been revamped and dug up for the SID display conference.
Anyway, here is the link to the Engadget post, which includes one of the videos demonstrating it. If you watch it, then from YouTube you can find other related ones, including the Dell one.