I am unsure: Your plan is to write summaries of proposals for future research or you are trying to do some research yourself (with interviews and/or case studies/scenarios etc)? To make it clearer: I am not exactly sure where you want to go. Try to decide what EXACTLY you want to ACHIEVE in the next weeks so you can name a goal/point that would make you say "DONE!" (if you haven't done so already).

I was doing some Twitter mapping research for another class and ran across this paper - does a study on collaborative decision making using Digital vs Physical vs Both tabletop displays. Thought it might be of interest: http://eniac.hopto.org/~whazlewo/publications/IEEETabletop06.pdf

The MIT Media lab has a unit researching TUIs. I don't know if it would be helpful to your work, but it might be interesting.

I will be interested to see how your project changes based on the feedback from the hands-on EDC experience.