[Sargon of Akkad]

I've been wondering if anyone can recommend some useful free online Korean language resources. Though I'm currently in Japan and have no immediate plans of visiting Korea, I have a lot of acquaintances from Korea. Though I'm able to read, write, pronounce and (partially) type Hangeul, I have next to no knowledge of the language itself, other than some basic stock phrases like 안녕하세요, 감사함니다, etc., and I'd like to find a good introductory course for basic conversation.

Ceterum censeo Ōsakam esse delendam!