I think Alta Vista did one of the best early translation services, but it was all western languages. Google Language Tools
now does Korean to English and vise versa. That's new and noteworthy!
Firefox running in XP won't render the Korean output, I'll try on a Mac.
Update: it works fine in both Safari and Firefox in OS X. Ahh, the beauty of a Mac. Incidentally, the all-but-forgotten OS X Sherlock utility also provides a wide range of translation services, including Korean. It's a bit more convenient. If I were using these things I'd keep sentences short, grammar very simple, tense present, and words long and formal. (Longer words tend to have more precise meanings.)