From their website (if you have personal experience of their courses, please leave a comment): New Concept Mandarin specializes in teaching Mandarin Chinese (Putonghua) as a second language. Act... Read more.

newconceptmandarin.com

Hanbridge Mandarin provides campus-based courses, online classes, and intensive cultural immersion programs. I don't know anyone who has attended any of their classes personally, but they cover the... Read more.

hanbridgemandarin.com

Online Chinese flashcards that adapt to your learning, Chinese speaking practice using voice recognition, and a simple, fast Chinese-English dictionary. Read more.

fastchinese.org

Have you ever wondered how names from other languages are transliterated into Chinese? There is actually a reference table where you can see how different sounds are translated into Chinese charact... Read more.

en.wikipedia.org