Hello !
I migrate our site to WordPress MU, and it seems WP_Multilingual has some problems with it : the foreach loop which runs ok on the WordPress 2.5.1 instance of the site (http://esbrp.ouvaton.org/wordpress/) shows nothing on the MU instance (http://esbrp.ouvaton.org/mu/). I added this code to the theme, and it seems the AviableLanguages array is not filled correctly (you can see the outpu on the MU instance) : only 1 element in the array, eventhough 5 languages are set in the plugin backend :
echo $GLOBALS['AviableLanguages'] . " / " . sizeof($GLOBALS['AviableLanguages']);
Bye,
Yann