Let's Learn Korean. From KBS WORLD.

Sogang Korean Program. From Sogang University. Has resources from introductory to immediate levels.

Online Intermediate College Korean. By Clare You and Eunsu Cho, University of California, Berkeley. Includes audio. Also available commercially as a book.

My Korean. 1-2 By Young-A Cho, In-Jung Cho and Douglas Ling, Monash University. Includes PDF and audio versions.

KOSNET: Korean Language Study on the Internet. From the Korean Government. One needs to create a free account.

YouTube resource, by Youkyung Ju, School of Oriental & African Studies, University of London.