Coder Mike Brittain has put together a super-clean site for iPhone, Blackberry, Opera Mini, and other mobile browsers that lets you quickly click two languages to translate words or phrases between and then do it. The site supports 11 languages at the moment, and you can easily bookmark a language pairing for quick access while traveling. Those without data connections should try Google's SMS translation service.
Mobile Translator [via MakeUseOf.com]