Hi,
the another big question is that why don't include JQuery to load automatically with _every_ pages? Now at least two wikis load JQuery v1.3.2 from common.js (see http://zh.wikipedia.org/wiki/MediaWiki:Common.js, http://hu.wikipedia.org/wiki/MediaWiki:Common.js), the UsabilityInitiative extension use JQuery v1.3.2 with cookie and browser plugins, and the collection extension use JQuery v1.3.2. Three JQuery, two version. This is not goooood...
Farewell, Glanthor