The Clever Zebra guys have joined the OpenVCE project which aims to proved an open source set of tools and artifacts for collaboration, meetings and training in 3D spaces well integrated with traditional 2D tools like blogs and wikis.  See Nick Wilson's post for more details.

This interests me greatly as there will be significant overlap with some work that we're doing to provide an integrated system for taking content from a collaborative 2D content management system and allowing the collaborators to launch a meeting in a 3D space (currently SL, soon to be OpenSim too)  taking the content with them to display on a scrollable, clickable browser, and having tight integration and archiving of the meeting chat with the original CMS.  All part of a big push to make 3D environments easier to access and really useful. I'll be fascinated to see what come out of the OpenVCE project.