Clay Shirky’s essay about Second Life directs us to focus on objects, not identity:
Like video phones, which have been just one technological revolution away from mass adoption since 1964, virtual reality is so appealingly simple that its persistent failure to be a good idea, as measured by user adoption, has done little to dampen enthusiasm for the coming day of Keanu Reeves interfaces and Snow Crash interactions.
I was talking to Irving Wladawsky-Berger of IBM about Second Life a few weeks ago, and his interest in the systems/construction aspect of 3D seems promising, in the same way video phones have been used by engineers who train the camera not on their faces but on the artifacts they are talking about. There is something to environments for modeling or constructing visible things in communal fashion, but as with the video phone, they will probably involve shared perceptions of artifacts, rather than perceptions of avatars.