The first meeting of the Hypergrid Adventurers Club involved 24 intepid adventurers risking all by crossing OpenSimulator-based hypergrid enabled grids and regions. For a full report see http://becunningandfulloftricks.com/2010/10/25/hypergrid-adventurers-club-meeting-1/
A common issue for collaborative uses of Second Life is the inabilty to select a real name or show it efrectively alongside an avatar in Secod Life. This is about to change. Unique usernames and "display names" will now be separate and can be used in flexible ways.
Google has said they will not continue development of Google Wave.
From our perspective it was just too difficult and very slow to use. Though its ideas were good and it did allow some forms of shared media, map and other shared whiteboard style uses in a convenient fashion. Its user and access policy also was really awful and did not encourage uptake.
Other forms of shared media that can be used within virtual worlds like Second Life and OpenSim will be explored by us.