>>6 The problem with Rosetta Stone, it's pretty expensive. And Rosetta Stone is for multiple languages. If you're going to buy if for just one or two languages, it's probably a waste.
>>1 For Japanese I use this website. If you want to learn everything about the Japanese language go here: http://www.freejapaneselessons.com/members/index.cfm
I only had to pay like fifteen dollars for the membership and it's only a one time payment, and you get all the lessons to be not only fluent in Japanese, but be able to read Kanji (And I hate Kanji!).
As for Korean, I don't know any places where you could learn it to be honest.