Duolingo
Duolingo: "With Duolingo you learn a language for free,
and simultaneously translate the Web."
http://duolingo.com/ As I saw in that website now it's about Spanish, German and also (coming later): French, Italian and
Chinese. This is the reason to post it in this "Learn Chinese" sub-forum of seo-forum-seo-luntan.com. Good luck, foreign language learners! Good luck, Chinese language learners!