From their own description:
Babelplex  is a bilingual search service that searches the web in one language and in another language via a cross-language information retrieval system utilizing AltaVista - Babel Fish Translation, Google Translate, or Yahoo! Language Search Tools for translation and utilizing AltaVista, Google, or Yahoo! for search. Sort of like plugging a Babelfish into a search engine to do bilingual search.
Languages include English to Chinese, Dutch, French, German, Greek, Italian, Japanese, Korean and vice versa. Results give you a split screen with your query translated on one screen and the other with sites in the language you specified. A useful tool!