Animated GIF demonstrating the articulation of the word "Season"

Some useful links containing information about speech production and various ways of visualizing speech production

Computers in Phonetic Laboratories: Speech Synthesizer

Multimodal Speech Synthesis: Animated faces

Articulatory Database: software and demonstrations

Lycos search: here you find loads of good links to web sites concerned with speech production

Lycos search related topics: speech perception

Lycos search related topics: speech synthesis

...something very unsettling about voiced fricatives

You can even buy it on CD: a course in speech production and perception

Visualizing the vocal tract by Magnetic Resonance Imaging

Vocal Tract Imaging

3D Images of the Vocal Tract Shapes

Acoustic Theory of Speech Production: splendid!