Collaborative tools based on the Web/Internet infrastructure such as E-mail, discussion groups, video/audio conferencing and virtual campuses have been proposed and implemented in many distance learning scenarios. Grids as Internet-wide resource infrastructures that enable access to large resource pools should permit new applications and learning activities. We propose ULabGrid as a new architecture that enables educators to design collaborative, distant laboratories for undergraduate students using the Grid infrastructure. We describe here the prototype that is being developed and present the results of our efforts to date.