Ok, latest offender in animation that goes beyond annoying and creates a sense of wooziness in the user -- Vignette Media.
Here is a screencast of this carousel gone wild.
What is happening is if you move the cursor to the dead center (horizontally) the animation will grind to a halt. If you move to the right it will rapidly get faster until it gives the true sense of the merry go round from the playgrounds of my childhood. Same if you move to the left. Doubt users will discover this "control" and even if they did it is really, really hard to use.
Needless is all I have to say. Thanks Theresa for sending it my way.
UPDATE: Forgot to mention the tagline "Your consumers want it: An engaging experience." Wow.