I'm a newbie^^, so I have no idea whether this has already been posted or not:
For people (like me, I admit) who haven't really mastered the keyboard yet..., there is a site which can be used as an "alternative" keyboard so to say:
http://www.wandel.person.dk/korean.html
"Do you want to write 한국어 - Korean characters that can be included in Web-documents and Email without using Graphics or Extras, then use the “keyboard” below and 한국어를 쓰십시요 and copy'n'paste the the “Calligraphy” to Word, or the HTML codes to your Email or HTML program. Or try my Multi Language Virtual Keyboard where I remap your US-keyboard to write Korean. "...