Apparently, this user prefers to keep an air of mystery about them.
9 Why were some letters like Q, X, C, chosen for Pinyin which confuse non-Chinese speakers? dec 26 '11
6 When do the tones change? dec 27 '11
4 How to convert from hanyu pinyin to IPA? dec 27 '11
1 What comprehensive grammar books are available? dec 27 '11