Try thinking about it this way. We've always been wondering if this trend is truly going to surpass fad, and with companies like Microsoft starting to seriously invest in the work being done it's confirmation that Metaverse technology is here to stay. It means, no, we're not wasting our time with projects like OpenSim and it really opens the field up for serious research and development.
Yeah this is a month old, but still a great thing to talk about!
We have RealXtend and OpenSim alongside Second Life now, which all share a similar architecture in common. We should try to find a traffic solution that incorporates them into the equation too. My suggestion was to build the traffic monitoring into the viewer (which all these worlds share) and then have the viewer send along all of the required data to an external DB for analytics etc. See my blog post at http://www.wammyshouse.com/?p=23 for the nitty gritty of what could be a nice all-inclusive solution.
It wouldn't really be a good solution though unless it was pre-built into the viewer, otherwise it would suffer the same opt-in problem that Alexa has for web statistics. So maybe a non-profit oversee's the db and provides nice stats for the public to access?