I think it would be great to have some indication of how many active instances
of XWiki are out there in the wild. The idea is not so much to know the figure
but to see how this figures evolves and thus to see if we're doing things right.
It will also give us information about how quickly or slowly our user base
upgrades from version to version.
More details at http://markmail.org/thread/gowutjcrfr62mq6t