Go see this site!
How do you gauge if you have really mastered a language?
Ans: by being able to do TONGUE TWISTERS in that language!!! :X
YES. i cant accomplish that yet, so that means i have a long way more to go. wahaha its not easy but fun to try! Oh, I will be compiling some sites that are useful to learning Korean. Shall do it some time later. (: This is one of the quirky sites i found. haha. The third one looks especially tricky.
I look forward to the day i master them.