Tim April recently defended his MS thesis . Tim’s topic of exploration was multitouch surfaces and how interactions with these surfaces might be improved with the use of tangible user interfaces. Here’s a picture from the defense (for more pictures see Flickr):
Tim is currently Security Researcher at Akamai Technologies.
 Tim April, “Comparing and Contrasting Manual Direct Touch Interaction with Tangible User Interfaces for Mapping Applications,” MS Thesis, University of New Hampshire, 2013