Read an article that's timely and helpful (too bad the Brand Managers who think up of most of the failed Second Life Islands don't read this stuff).
I won't go into the details - just read the article. I've found, with my work on the IBM Business Center - providing metrics -that one part of my analysis is providing metrics - who's coming, what they did, why…etc. Another part, which I've held back really promoting - is accessing if the idea of what's being built is really effective or not.
By in large, the biggest failure of Virtual Worlds so far, is not the platform, it's the people who are thinking 2D when they need to think in 3D; they take a 2D website concept and try to make it work in Virtual Worlds - and most of the time, it doesn't - and the results are dismal.
Don't need to find fault with the platform - even though it has it's limitations.