Anyone know what this might be? It started a few days ago as a short black bar right the top of the screen, and it's now migrating down the display (top of the image is the top of the iPod screen). To the naked eye it looks like iron filings, and I can squish the screen to make them move elsewhere. I've mostly pushed them out of the area where the artist name is displayed in the music player. Now that I've taken a photo it's clearly individual pixels. Is there any known cure or is this the 'grey goo' of iPod screens? Edit: check it out, I turned it on a few hours later and it's moved again.