Sinoling.com
- This site offers a variety of Mandarin Chinese language resources, categorized into linguistics, links, culture, and reference. There is also an interactive forum.
- http://www.sinoling.com/

XueZhongWen.com - Your online Chinese buddy
- This is an online portal and forum for students of Mandarin Chinese at all levels. Topics range from listening, grammar and idioms to Chinese history and culture.
- http://www.xuezhongwen.com/

Pinyin.info: A Guide to the Writing of Mandarin Chinese in Romanization
- This site presents rules for using pinyin and other romanization systems, as well as non-romanization systems. It also contains related tools, books and links.
- http://www.pinyin.info/

Similarities Between Tongyong Pinyin and Hanyu Pinyin: Comparisons at the Syllable and Word Levels
- This research paper discusses similarities between tongyong pinyin and hanyu pinyin at the syllable and word levels.
- http://research.chtsai.org/papers/pinyin-comparison.html

Min Multimedia
- This site offers simplified Chinese tutorial lessons, with hyperlinked characters and flashcards.
- http://www.minmm.com/