Link: http://www.zhongwenred.com/

Learn Mandarin Chinese quickly and easily! Zhongwen Red is one in a three-part series of free Mandarin Chinese online courses.
This is a vocabulary-centered language learning program. Each lesson centers around a vocabulary unit that is presented in the context of several example sentences, then expanded upon by a short dialogue.
All of the material on this site is available for free download. Listen to the lessons on your MP3 player, and use our PDF transcripts just as you would a regular textbook.
All audio recordings on this site are made by native Mandarin Chinese speakers from northern China.