Romanization For Mandarin

Why learn pinyin?
Explains why learning romanization is important for foreigners learning Mandarin

Why Native Mandarin Speakers Should Learn Pinyin
Gives the advantages a native Cantonese speaker can gain by learning the romanization system

Mandarin Sounds
Breaks Mandarin sounds into their component parts and gives the romanization symbols for the sounds

Mandarin Tones
Explains about the Mandarin tones and conventions used for marking them in romanization

Pinyin exercise
Short exercise for learning the Mandarin tone system

Mandarin sound chart
The chart is a fairly comprehensive list of Mandarin sounds.  Some rare sounds are omitted.  The chart gives the romanization, a representative character (ideal for native speakers to learn pinyin), and a recording of how the sound is pronounced.