Some links (not complete) of friends/aquaintences/colleagues who work in a math/visualization/mediaart/interactivity related area:

jreality groupTim's current collaborators on JReality: Peter Brinkmann, Charles Gunn, Markus Schmies, Holger Pietsch, Ulrich Pinkall, Steffen Weissmann
Mary Flanaganthe gaming specialist - our favorite: the game on the six circles theorem
Henry Liebermaninteractivity from the agents group...
Richard Palaisexplore 3D-X-plor math!
Ken Perlinis the reason for the creation of jReality. His website has been included as a gatepage in the Whitney artport...means his site is pure art...:-)
Juergen Richter-Gebertis the creator of Cinderella an interactive geometry software. He is also active in mathematical visualization and related areas.
Marcus du Sautoy, Shani Ramhave e.g. created the music of the primes website. Our all time favorite is the shooting primes game.