We can't use the comScore numbers any more because they were not tracking mobile devices.  Since a lot of our traffic is now coming from mobile devices, comScore numbers were showing a sharp decline, but this was not a reflection of reality.  We've been working on a way to measure uniques that's sensitive to privacy, and we're very close to release that data, we're just working on the blog post now.  One of the drawbacks is that we can't report on a single total number across all our projects.  We'll have an announcement shortly but until then I'll see if we can share the numbers with you privately.  Since we can't compute one total number, would you give us a list of wikis that you would like numbers for?

Dan