digchinese.com
Forums
Livemocha
Vocabulary and phrase lists organized into lessons. Chinese lessons contain audio clips with the pronunciation of each vocabulary item. Social network features and userplane chat client let you find language exchange partners.
chineselanguage.org forums
Forums for discussing Chinese. Includes discussions about dialects other than Mandarin such as Hakka and Cantonese
ChinesePod Forums
Forum for discussing Pinyin, Written Chinese, Grammar and other topics related to learning Chinese
