#MediaWiki. Without plural support the localisers at translatewiki.net do ask questions.
Learning that Jan Luca has written plural functionality for the Toolserver I18N-framework is therefore very welcome news. It is not yet in production because he wants a second pair of eyes. Krinkle has given the code a first glance over and he promised to have a good look this weekend.
With better internationalisation support, it becomes increasingly worthwhile to make Toolserver tools ready for the international audience that is our Wikimedia community.