For over hundreds of years people have been gathering around tables for the purposes of eating, conversing, working, and entertaining. Co-located collaboration researchers exploring alternatives to traditional “desktop” computers are beginning to exploit the benefits that this familiar environment appears to have for facilitating social interactions. Studies of tabletop collaboration involving traditional media (e.g., paper and pens) show collaborators often partition the tabletop workspace into various areas (e.g., personal and group). Just as partitioning of our physical spaces helps to maintain social order, such territorial behaviour on a tabletop workspace appears to be an important mechanism for organizing collaborative activities. This research further investigates tabletop territoriality, through new observational studies, as well as development of territory-based interaction techniques for tabletop collaboration. Initial results from these observational studies are presented, along with a proposed test-bed environment for exploring territory-based interaction techniques.