Recently an expert group for ubiquitous collaboration was initiated, the founding meeting was in Vienna. I collaborated, read the press release of the group:

The Ubiquitous Collaboration Expert Group kick-off meeting collocated with the EU CWE projects concertation meeting at the TU Vienna on Dec 6. was a great success.
Representatives from CoVES, DiFac, inContext, Nepomuk, POPEYE, and Nepomuk presented their projects and participated in a fruitful discussion on "Standardization of Collaboration Services". We are very happy to have them join UbiCollab. Many thanks to all participants demonstrating their interest in jointly driving future UbiCollab activities.
Presentations, discussion results, and fotos of the kick-off meeting are
available online at:

http://www.ubicollab.net/