http://www.youtube.com/watch?v=2Y4CALFwgUY
That's the video with Ayu's supposed slip. It's still pretty well-discussed and one of the most-watched videos of YouTube Japan.
I think this is one of the most interesting stories regarding how powerful 2ch is in Japan. If only a few people decide to humiliate someone they can unleash an incredible avalanche of hatred, even though based on lies only, through 2ch.
Poor Ayumi, but I guess this story is indeed water under the bridge now.