According to the site, it supports "view sharing, discussion, graphical annotation, and social navigation and includes novel interaction elements." That may sound dull, but watch the Flash movie (a paper is also available).Sense.us is amazing. Imagine how it could be used not only for collaborative research, but also as a way to prep data for lectures, or support in-class exploration by students.
Thanks to Mike Love at SmartMobs for the link.
