People can scan the QR code on their badge, then walk in front of a Kinect and projector and it can display overlay information on top of people and they can connect and tweet by simply standing close to each other.
inZair ZMS is being demonstrated at Lift12 in Geneva, can be used for free instant messaging and also provides social networking, localization layers are more.
Teradici is doing software optimization using the PCoIP (PC-over-IP) protocol to run a full x86 desktop remotely over the Internet onto an OMAP4460 device. Here in this demo remotely using an x86 desktop that is over 2000 miles away (and considering that Internet connections at trade shows can be unreliable).
Obigo shows their web browser running on a smart TV, on a Smartphone, Tablet and more. Their software solution on Android also enables to customize home replacements for Android based on HTML5.
VMware now supports a secure enterprise version of Android at the same time as you can run your personal "hackable" version of Android, both on the same device in a fully secure virtualized way.
He was showing some pretty awesome magic tricks at LeWeb, using the Kinect, 3D graphics from 3Dvia and real elements, you can find more videos featuring his magic on YouTube: http://www.youtube.com/watch?v=w2fyUj1NKyw
They are providing some recommendations system for TV shows.
The idea is to provide an augmented reality user interface for navigation on top of the camera view.
This is an app for digital comic books.