Reading through the version update note for WritePad for iPhone, one item stood out of its short list: Support for Bing Translator. I had not hear of this before (or have forgotten) and went searching for it. You can find this web-based written language translator at:
...works too. But, it just redirects to MicrosoftTranslator.com. It can translate anything from a single word/phrase to an entire web page (just enter the site's URL). I liked the way it places the original and translated web page side-by-side (see screenshot above).
Microsoft also provides a Translation Bot that can be used with Windows Live Messenger. Add email@example.com as a contact and invite it into a conversation for translation assistance.