My saga may finally be over.
Tonight I picked up my 3rd iPad 2, 2nd replacement, and I'll be keeping this one. Before you ask if my screen is "perfect", it's not (I'd say it's as close to being perfect as it can get, without being perfect,that is), but that doesn't mean there are problems with it.
Every LCD screen I've ever had has some minor imperfections here and there that are barely noticeable (unlike some of the ridiculous bleeding a lot of us, including myself, have experienced).
At 60% brightness, my iPad 2 presents no noticeable bleed or dead pixels.
At 80%-100% brightness, my iPad 2 has the tiniest few specs of backlight bleeding on the left side, but ones that are, again not very noticeable, even when watching a movie at 100% brightness in the dark.
Honestly, it's better (way better, actually) than any unit I've had so far, and this rinse and repeat process of returning has worn done on me. I'll be keeping it as I'm pretty content with it and these few imperfections don't bother me in the least.
Here's a picture of 100% brightness (taken with iPhone 4)
80% brightness:
And one at 60% (default - taken in the Apple Store bathroom in the dark )
Hope this helps. Case closed.
Looks pretty good to me.