Hi everyone! So we've had some discussions that are summarized here: http://www.mediawiki.org/wiki/Third-party_MediaWiki_users_discussion/Summary
In this letter I want to point out to two projects that haven't been organized by Wikimedias, but are still very useful for the people who think about MW as of open source product: 1) http://www.mwusers.com - MediaWiki forum. Many people prefer forums to mailing lists and wikipages like Support desk. Moreover, MWusers is now a good Q&A database. 2) http://wikiapiary.com A wiki with various statistics about MediaWiki installations and statistics about extensions. I see the huge potential in this project although it's only several months old. Template:Extension on mediawiki.org have finally turned to something useful when the link to wikiapiary had been added there.
If WMF/Wikimedias interested in promoting MediaWiki not as WMF project but as a piece of open source software, it can be beneficial to help those projects with information support (i.e links from MediaWiki.org), funding and cooperation.
----- Yury Katkov, WikiVote