Computationally-enhanced tables are an emerging technology that have the potential to enhance face-to-face group activities. Designing interfaces and interaction techniques for this novel class of devices is a challenging area of HCI research.

Interactive tabletops offer benefits in many application areas -- in my talk, I will present prototypes from several domains, including:

• TeamTag - a productivity application for bio-diversity researchers that supports labeling and searching through digital photographs
• La Mesa de Clasificacion - an educational application for foreign-language learners
• SoundTracker - an entertainment application supporting group music-browsing

I will discuss the design challenges presented by tabletop interfaces, such as orienting information on the horizontal surface, coordinating the actions of multiple users, and balancing individual and group needs. I will then describe the ways in which our prototype systems meet these challenges, as well as presenting the results of studies evaluating the interaction solutions offered by these applications.