I see that its possible to have questions/answers in any language. Is it possible to have fully localized user interface as well - all menus, links, buttons etc? We are looking to build Russian law QA website. Most visitors will not speak English at all. We'll be happy to help with resources translation if needed (I do realize that is no OS project, though).
FAQ on Area51 links to meta.stackoverflow.com but it seems that meta.stackexchange.com is a better place to ask questions on StackExcange engine not specific to StackOverflow. Here's good localization question to be voted for instead of this one: http://meta.stackexchange.com/questions/73/what-localization-features-does-stackexchange-have