I have a i7 ordered since december 10th (in a reseller).
I am becoming sick of reading this threads..
OF COURSE that these problems (especially the yellow thing) are widely spread - thus the increased level of complains are not an "anti-apple campaign" like some users like to think.. But OF COURSE that the surveys made by some sites (especially the imac.squeaked.com) are NOT reality-representative.. The majority of people with problems-free iMacs (or near it) do not give a **** to those surveys / forums - only people that found problems and started googling about them......
And what is the problem of buying one now?? If it has issues Apple, without complains or bureaucracies, replaces it. So, my opinion is that people should not think of not buying it only because of these issues..
I myself have a 2 years-old toshiba satellite and, doing the imacs tests for fun, found that the bottom grey bar is much lighter than the upper one - and I had NEVER noticed it and I would NEVER notice if I had not done the test.. of course that if you give 2000 for a computer you expect it to be perfect, but you cannot make any possible test to it, otherwise you will find, even being small, something - try to do a COMPLETE check up in a hospital and you will definitely find out that you are perfect!
With this I am not saying that you should not be angry with the problems or that you should not replace your iMac in case you found them, especially if it is a really visible or annoying one... I am saying that, in every product of every kind, there are a big number of them in which you find problems if you deeply test it - it is not new and it does not only happen with Apple.. But with one thing I must agree: Apple is doing very little for correcting these problems.. Apart from a freeware update to the flickering (that most users say did nothing) and a delay in deliveries, Apple seems to not know the answer to the problems.. especially in what concerns the display (dead pixels.. yellowing..)