Inline TeX support for math formulae is now enabled on Wikipedia in all languages on phase 3; please try it out and report any functional problems.
Those interested should probably put some documentation together; some is on the test wiki at: http://test.wikipedia.org/wiki/Texwiki_docu
For those helping to maintain translation files, I've attached a diff of Language.php which shows the math options and a number of other additions of the last month or so that haven't been localized as widely as they might.
-- brion vibber (brion @ pobox.com)