As the ubiquitous and pervasive computing paradigms gain popularity, Mobile Ad hoc NETworks (MANET) are receiving the increased attention of the research community. Essentially a MANET is a collection of mobile nodes communicating over wireless channels with little (if any at all) fixed, wired infrastructure. Such networks present a number of new challenges to many cryptographic techniques for collaborative group communication including Group Key Agreement. In this report are presented these challenges, some Group Key Agreement protocols proposed for Collaborative Groups and a discussion on their suitability for the MANET environment.