Hi,
Thanks to some awesome work by Addshore, ExtensionDistributor download stats are now sent to graphite, and aggregated in a pretty dashboard[1], which is filterable by branch and extension. (Note: the ordering is sorted by max and not total, that's a known bug[2].)
The top 15 extensions and skins over the past 30 days are also shown on Special:ExtensionDistributor[3] and Special:SkinDistributor[4].
[1] https://grafana.wikimedia.org/dashboard/db/extension-distributor-downloads [2] https://phabricator.wikimedia.org/T120337 [3] https://www.mediawiki.org/wiki/Special:ExtensionDistributor [4] https://www.mediawiki.org/wiki/Special:SkinDistributor
-- Legoktm