Chinese Learning Club: Free online Chinese classes include language (reading and writing), tradition and folk dance, Chinese knotting, Tai-Chi Chuan and Tai-Chi sword.
Chinese Multimedia Tutorial: Short tutorials for learning and speaking Chinese.
Chinese4fun.com: Online sample lessons for learning Chinese, geared toward kids. Part of a larger fee based online course teaching Chinese and Mandarin characters in an interactive format.
ecChinese.com: Offers lessons in which you listen and repeat.
Free Chinese Lessons: Introduction to Mandarin, with sections on pronunciation, reading and writing.
Write Chinese: A demo Java applet that teaches Chinese calligraphy for 75 common characters in both traditional and simplified form.