The idea is simple and elegant and, it has been implemented with the Oriya Wikipedia in mind. It looks like this:
and it will send you to the Oriya Internet article. The application is created for Oriya however, it does allow for other languages as well. Just replace the or with the language code of another Wikipedia.
There are all kinds of possibilities with such an application. When it is integrated with the Babel extension, it could provide an article when the article does not exist in the requested language.
Srikanth Lakshmanan created a really nice program that deserves a much wider application.