Effortless English - strongly recommending

I strongly recommend AJ Hoge's Effortless English, it's quite suitable for adult ESL learners.
His pronunciation may not be so perfect, but his way of teaching is perfect - natural acquistion of english words/phrases/grammer.

With his method you will enlarge your vocabulary unconsciously and effortlessly although you have to devote much time. No pain no gain.

http://effortlessenglish.com/