The latest trends in distributed and mobile collabora- tion technologies allow people to move across team forms and organizational boundaries as well as to collaborate among/in organizations and communities. The ability to query the company's distributed knowledge base and to cooperate with co-workers is still a requirement, but new paradigms such as service-oriented computing increased pervasiveness, and mobility enable new scenarios and lead to higher complexity of systems. Independently of the busi- ness domain, private "collaboration" has become a hot is- sue. Virtual communities, may these be social networks or virtual enterprises, have enjoyed a tremendous popularity recently and are starting to require functionalities for col- laboration in the broadest sense similar to those in business environments. The wide-spread availability of mobile de- vices makes support for mobility an arising topic in this do- main as well.