Somebody's post on alt.humor.best-of-usenet led me to the AltaVista Translations page, where you can enter a phrase and have it translated to or from several European languages. Quickly. Inaccurately. The author in question had followed the only logical course of action, feeding the results back into the machine until the translations "bottomed out," and no more linguistic mutations occurred. I have automated the process.
Source code (gzipped tar file of PHP and SQL)
See the Most Popular Phrases.