Integrated Korean: Intermediate 1 (Klear Textbooks in Korean Language)

This has got to be an example of how to produce a series of books taking a student from ab initio level through to an advanced level.
The books a set out in a logical manner and carry enough explanation of grammar points to make learning solo possible, not that that is the best way of course.
The dialogues are now available on the University of Hawaii website as free MP3 downloads.
The workbooks that accompany the texts are also excellent, even if you don't like conjugating verbs, you have to learn to do it! It's just part of the process. I have found some of the exercises stimulating as well as challenging.
All in all this series has to be considered excellent.

This series teaches pretty useful grammar. I've been living in Korea for the past seven months so I constantly pay attention to how Koreans really talk. I was kind of disappointed with some of the topics in this book and accompanying vocab. I'm just not real interested in knowing detailed post office or clothing vocabulary. My wife has found the workbooks helpful. The listening comprehension has been pretty helpful--there's a correlated link with the University of Indiana's Korean language program. I wish they'd speak a little more colloquially, but it hasn't been that detached from reality. Overall, I've been pleased with this series. This book was my least favorite so far, but still overall helpful in teaching useful grammar, providing good listening comprehension, and teaching some good vocab.

Good clear grammar and vocabulary explanations. I've studied three or four different texts at this level, and this one provides the clearest explanations I've seen up to this point.