This is mine:
http://www.youtube.com/watch?v=oLGt0KrFtSQ
http://dl.dropbox.com/u/2668314/foto.JPG
http://dl.dropbox.com/u/2668314/DSC06213.JPG
http://dl.dropbox.com/u/2668314/foto 2.JPG
I have a 27-inch iMac (late 2009).
First display: stains on the screen (like dirt)
replaced
second display: stains again
replaced
third display: nasty backlight bleeding plus a nice dead pixel.
On the first and second display I had no issue of backlight bleed whatsoever therefore it's NOT normal at all. Every screen has some level of backlight bleed that's for sure but not as severe as the ones shown here.
I'm calling Apple tomorrow to make an appointment and have the display replaced once again. You should do the same in my opinion (unless the issue doesn't bother you, of course).
Doesn't look to good for you! Like I said in my post earlier in this thread, I sent mine back because I can't handle this backlighting issue.
In your Youtube movie we can clearly see the problem. As for me, I watch a lot of movies so I can't bare to watch it with that problem.
I bought my iMac online August 1 and got it August 11, they sent me a new one August 18, got a new one August 24 and sent that back as well.