I've gotten so much out of this thread, I thought I'd share my two cents worth...
I received my iPad on Friday and I was immediately disappointed by the yellow-ness of it. That's when I started Googling and found this thread. So, I recognized a problem before I read about it anywhere... this isn't hypochondria.
I tried to get used to the display all weekend, but it just never got any better. I went to the Apple Store yesterday to replace it. The Genius gave me two options...
First option was that he would give me a "genius swap", but he would do this only once, since the display was definitely yellow, but it was not outside of the acceptable range, according to his manager. However, if I did this, it was mine. I couldn't return it within 14 days for a full refund. I would have to live with the outcome. That sounded weird to me, but he's the Genius, so whatever.
Second option was to do a full return and re-buy.
I did a return and re-buy. Sadly, the new one is just as yellow as the old one. I started doing things to burn in the screen after reading about them here and elsewhere, but after 14 hours of burn in, the display hasn't gotten any better.
My plan is to wait a week and do another return and re-buy. If that one isn't any better, I'll return it and just wait a month or two to see it this settles out. Personally, I find the yellow screen unusable. YMMV.
If you do the "Genius swap" option, it might be a good idea to make sure you're not giving up your right to return it for a refund.
Thanks.