Hi everybody,
Sumana suggested I should post to this list so you guys can help me.
A few years back I saw a need in easy widget creation and too many extensions that just did that, but were not so well maintained and had a bunch of XSS holes in them and so on, that's when I came up with idea of Widgets extension: http://www.mediawiki.org/wiki/Extension:Widgets
Since individual widgets were just wiki pages, I created a standalone wiki where everybody can post their widgets (in special "Widget" namespace) which will be available to everyone after basic security review (it integrates with Flagged Revisions if it's installed): http://www.mediawikiwidgets.org/
There are plenty of widgets there and quite a few people use the extension and the widgets on their wikis.
That being said, I moved on to other kind of work and would be happy to give MediaWikiWidgets.org back to community instead of slowly killing it by inactivity. It would be great if Wikimedia Foundation could take this project over and host it either as standalone site or as part of mediawiki.org - I'll be happy to assist in moving the catalog and would probably still be curious enough to contribute a widget or two once in a while.
Best,
Sergey