I'm investigating something with the front facing camera and wanted to poll opinion from other Galaxy Nexus owners to know whether they were seeing this issue too.
It would appear that the angle the camera is aimed at when the phone is being used in portrait orientation is a little off.
I've taken this photo with the phone laid on my desk and am holding the pen 30cm away dead centre over the screen (top to bottom). I've rotated the image and flipped it to show what I see on the screen - you can see it here.
AFAIK at those distances the pen should be pretty central (horizontally in the picture - it clearly isn't!
If you're able to test this please let me know either way.