For the record, I went to the TTMIK Language Cast last week and found it pretty useless. The venue was so loud and crowded I couldn't hear anybody, and I was speaking with English speakers most of the time. The Korean speakers were mostly Korean hanging out in a corner speaking rapid fire full on Korean. Everyone else was hitting on, picking up or flirting with a person of the opposite sex in English. It felt like a pick up scene and most of it was in English as afar as I could tell. It didn't do much for my Korean.
To be fair though, I went with a friend who said it worked great for him. He plans to go again next week and I agreed I'd give it another try. I'm leaning towards the idea of getting a tutor.
Also, I and some friends attend the free langugae courses at the Korea Foundation Cultural Center. You should check them out if your interested. We generally try to get togeher afterward and try to speak Korean only for ten minute segments. After a few beers we all sound great ;-)