Alex Telford explains how to create a library of mouth shapes and other expression components, in a series of 14 videos.
We have another blender tutorial for 3D world magazine
This time we take a look at rigging a character with a phonemes library, and then we take a brief look at how we would go about lip synching.
This is a very long tutorial (broken into 14 videos) to get as much detail in as possible while sticking to the time constraints :)
Apologies about my voice getting a little dry by the end of it