Wednesday, September 1, 2010 at 2:07AM 
This video covers a slightly less conventional use of the Trapcode 3D Stroke plugin. The 20-minute tutorial explains the creation of the wing strokes, rigging to null objects, and animation and compositing tricks.
Advanced 3D Wings in After Effects from Iaenic on Vimeo.
ADDENDUM
There is a really cool rework and extension of this here: http://vimeo.com/29663169
Tuesday, March 23, 2010 at 2:09PM 
View quicktime movie
Sound Keys was first used to extract three separate streams from the base region of the audio spectrum. Then three instances 3D Stroke was used to create the "strings". Each has an animated path that describes a vibrating string. 3D Stroke's Path Time, found under Advanced, was used to control the movement of the strings. Each has an expression where a sine function describes the general movement of the string and this is then multiplied by the stream extracted by Sound Keys so that the strings appear to vibrate with their corresponding base frequency.
Download AE 5.0 AEP
Download AE CS4 AEP