Nice and useful thread! :) I haven't had time to pursue my Korean self-studies that actively lately but here are some sources I've found so far and that I find useful.
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Korean keyboard online:
http://www.lexilogos.com/keyboard/korean.htm
Free. You can type the words in latin alphabet and it converts them into Korean characters. See the instructions at the bottom of the page. Very useful.
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Seemile Video Lessons (Youtube videos):
http://seemile.com/renewal/package_list.jsp?pkg_no=21
At least partly free. I really like and appreciate this site. It offers free video lessons with a Korean teacher. Each lesson is about half an hour long.
I have only watched Jenny's four first lessons but I'm going to continue with them. Although things are sometimes explained a bit slowly and simply (I'd like to learn more profoundly of the language faster and sooner) it feels like you are in a class room and for me it is a good way to learn. And Jenny is a nice teacher. :)
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Flashcards:
http://quizlet.com/subject/korean/
Free. On this site you can find many different sets of flascards created by different users. Just type "Korean" in the search box (my link should lead you to that search result. However, if it doesn't work, the link for the home page is:
http://quizlet.com/
I think this is a nice way to learn new sets of words (like colours, numbers, weekdays...) and test yourself.
These three I can recommend for now. If I discover new useful resources, I'll let you know! :)