Hanja Dictionary. It is a dictionary of Hanja, or Chinese characters used for Korean. Rather than there being a search box, you paste a Korean reading or a Chinese character into the URL and it displays the character along with word combinations that use that character.
I have a friend that lives in Korea and he told me that although Korean doesn't use the Chinese characters with the same frequency as Japanese (Japanese is not a Hiragana-only language), many words in Korean are Chinese character combinations not unlike ON YOMI character combinations for Japanese. Thus, by memorizing the readings to Chinese characters in Korean, you can learn BUCKETS of words with very little effort.
Which leads to another project: Korea-Town, or location based chain stories, with a different location for each Korean character reading. The amount of time required to create such stories is very small, and the long-term payoff is quite large (As I have learned with Japanese and Chinese). While making a "Korea-Town" mnemonic system isn't high on my priority list, it is certainly there now. I think I will hold off on learning more Korean until I can get flesh out the "Korea Town" mnemonic system.
Once I am finished with my other projects, I will use the above dictionary to group Chinese-derived Korean characters (Hanja) by common reading, and think of a story to link them all together. If you are learning Korean, please give this a try, as I think it will be just as beneficial as the "Kanji Town" and "China Town" mnemonics have been.