If you've decided that you'd like to learn Korean, here are some resources (both websites and books) that you can use to help you along the way ^^ If you want to add a resource, reply to this post and I can add it to the list ^^

Websites:

<a href="http://www.zkorean.com" target="_blank">Zkorean</a> - Online Korean dictionary, also provides pronunciation and romanization guides.

<a href="http://rki.kbs.co.kr/learn_korean/lessons/e_index.htm" target="_blank">KBS World</a> - Korean lessons mostly geared towards travelers visiting Korea, but still has some helpful lessons.

<a href="http://www.lifeinkorea.com/Language/korean.cfm?Subject=phrases" target="_blank">Life In Korea</a> - Has phrases geared towards travelers, but also has really helpful vocabulary lists.

<a href="http://www.hanbooks.com/" target="_blank">Hanbooks</a> - This is a company based in the United States that sells many Korean things, including Korean textbooks. I've made several purchases of textbooks from them and their service is very good - the prices are reasonable and the items are shipped quickly.

<a href="http://koreanlanguagenotes.blogspot.com/2005/11/do-you-know-any-good-korean-slang.html" target="_blank">Korean Slang/Idioms</a> - This is a blog from 2005, so I'm not sure how much of this is still relevant, but it seems to be more idioms than actual current slang, so you may find some good expressions here.

<a href="http://www.geocities.com/idontevencarenomore/" target="_blank">Korean Slang Dictionary</a> - This is a Korean slang website, I'm not sure how much of it is accurate, but I typed one of the dirtier words into google to verify its accuracy and was rewarded with a very graphic picture that let me know that the word I chose was accurate There are many swear words in this site, so if profanity offends you, give it a pass.

<a href="http://www.wordshowers.com/" target="_blank">Word Showers</a> - This is a Korean vocabulary website with about 3000 words divided into nouns, verbs, etc. and the n divided into lists of about 10, by subject. If you've gotten Korean grammar down and just want more words to increase your vocabulary, this site's great for that, and you can download mp3s with the pronunciation of the words in each list.

Books:

Ganada Korean For Foreigners
compiled by the Ganada Korean Language Institute, translated by Lee Kee-Dong

This is the series of textbooks I use to learn Korean. There are 6 in all - 2 elementary, 2 intermediate, and 2 advanced. Each book comes with a set of CDs so that you can hear the dialogues in the book. The lessons are short and therefore easier to handle, and they give thorough grammar explanations and plenty of practice examples.

You can order them at Hanbooks - go <a href="http://www.hanbooks.com/koreanlanguage.html" target="_blank">here</a>, they are towards the top of the page.

Handbook of Korean Vocabulary - A Resource for Word Recognition and Comprehension
by Miho Choo & William O'Grady
ISBN: 0-8248-1815-6

I'm not sure if this book is available new, but I got a used copy from Amazon and it's quickly becoming one of my favorite Korean resources. It has an in-depth pronunciation guide, much better than the ones I've seen in any other book, and it sorts the Korean vocabulary by roots so that you can learn the meaning of the roots and expand your vocabulary exponentially. If you're serious about learning Korean, I highly recommend getting this book.

Korean Grammar for International Learners
Ho Bin Ihm, Kyung Pyo Hong and Suk In Chang
ISBN: 89-7141-553-3
Order from hanbooks <a href="http://www.hanbooks.com/korgramforin.html" target="_blank">here</a>

This book is an immense help to anyone who really wants to master Korean grammar. It's recommended for intermediate learners, because although there are English translations for each sentence/example, the examples can be pretty complex and it's best that you have a prior knowledge of Korean to get the most out of this book.