There's a new initiative over at the Media Grid groups; it's called Psychology of Immersive Environments Working Group, or "PIE.TWG" for short. I recently attended their first meeting in Second Life which was enthusiastic and to the point. The group intends to move forward research in the virtual world along a number of separate strands but I think the greatest benefit will be in bringing together Psychologists and related researchers under a single umbrella group.
The groups aims as set out in their charter are:
The Psychology of Immersive Environments Working Group (PIE.TWG) is responsible for 1) advancing basic and applied research on the psychology of immersive environments, 2) promoting immersive experiences and programs that are psychologically beneficial, 3) defining best practices for the early identification and assistance of at-risk users of immersive environments and the treatment of individuals currently manifesting symptoms of immersive disorder, and 4) collecting and disseminating scientific and professional information on the psychology of immersive environments.
This sounds like a bold and timely move. I'd recommend a look at their website and if your interested check out their evolving Forums too.