I have a little experience with Korean, their writing system is certainly elegant and ultimately much easier to learn than the Chinese characters in Chinese or Japanese. The radicals in the characters represent sounds, once you can learn them it becomes easier (similar to how you learn to "sound things out" in English words).

Unfortunately, the different vowels and other parts of the language can be a bitch. I haven't personally used the Rosetta Stone course for Korean, but I would suggest using that simply because you'll need native speaker's audio files to get used to the funky vowels.

One good thing about Hangul is that when you learn the symbols for the individual consonants and vowels, you will be able to read any syllable and with the acquirement of phonological qualifications you can read any modern text. Contemporary Korean has by and large done away with Hanja (Chinese characters) in mainstream texts so it is much easier to read than, say, Japanese.

I've been studying it while I live in Korea for the past two years. Learning the alphabet and pronunciation is fairly easy, but the grammar is tricky at first. I use a textbook and then go out and embarrass myself by trying to use it around town, and the pain of feeling awkward in public around cute girls etches the phrases and vocabulary that I memorized that morning into my memory forever.

I've used a couple different series of books. I didn't like the Pimsleur tapes, as they didn't explain the context of the wide variety of grammar forms or the appropriate situations to use them. This textbook series is my favorite:

http://www.amazon.com/Textbook-Edition-Revised-Enlarged-English/dp/8953905532/ref=sr_1_1?ie=UTF8&qid=1339039217&sr=8-1

This is gonna sound rather silly and it is but on YouTube there's a Korean girl who calls herself "professor oh" the recent videos are ridiculous and strange. She dresses up like different people with voices etc but to learn the alphabet and how to write it out check out her first few videos they're very helpful!!!

My understanding of spoken korean is about 90%.
But my vocabulary is average and my reading is really slow, so I am looking for a way to speed it up.
I have been looking around for manga/manwha or books to read but without success. Does anyone have any suggestions?