Piers Messum - Teaching pronunciation: choosing an approach
Roslyn Young - Using a three-dimensional chart to teach English pronunciation
Ros mentioned two videos that illustrate the very different articulatory settings of English and Chinese. Notice how the tip of the tongue is perfectly positioned in the English speaker's articulatory setting so that it can repeatedly rap against her alveolar ridge.
For updates to these materials, subscribe to the PronSci mailing list.