Diamond Sutra in Hangeul:
http://kr.buddhism.org/한글-금강경/

With both Hangeul and Hanja, Chapters 1-15:
http://www.buljahome.com/amsong_dia/song_file.htm
With both Hangeul and Hanja, Chapters 16-32:
http://www.buljahome.com/amsong_dia/song_file2.htm

The Diamond Sutra chanted in Sino-Korean
(both the Hanja and Hangeul are displayed):

An here’s one by Geumgang Seunim: