We used the computer vision table in a performance at the Street Theatre and at This is Not Art in Newcastle. The final version had an aluminium frame which can be pulled apart (thx for the idea Lisa). and two small downward firing lights.
In the performance we made an iceberg of paper over the bottom of the frame so that the light would reflect more easily. The camera sits on a neat plastic box that also helps to diffuse the light. We didn't put any sides on the table so that the audience see what was going on.
With this setup and the PS3 camera and ReacTIVision running on Ubuntu 9.04 we had a very clear image of the surface and it was possible to see fiducials right up the edge of the table.
In the show, the teacups were lighted with superbright LEDs courtesy of Muttley, so cool.