zKorean Dictionary Search - English-Korean, Korean-English translation of words and short phrases. About 30,000 terms. Includes FAQ and some tips for searching. - http://www.zkorean.com/dictionary.shtml
Bluedic - Korean-English, English-Korean dictionary with a simple search box. - http://bluedic.com/
Korean-English Dictionary - Glossary by Leon Kuperman. Available in several file formats. - http://www.gutenberg.org/etext/5739