Hello All,
I want to add my experience to the long list thus far. I don't think it is limited to "pre LED". I had purchased a 15" MBP (SR) LED backlit glossy when they first came out. The original display may have had this when I bought it, but I didn't notice until months later. The display was replaced 2 times in between for other issues and was sent back on one occassion due to these SPLOTCHES of dark pixels. The technician(genius) said he couldn't believe the guy replacing this wouldn't have noticed.
Anyway, I finally got my machine back after weeks of repair tag and I made sure with the genius before I left that the display was free of defects. Fast forward a few months and now a small splotch of dark pixels has shown up in the mid/upper left area and is horribly in my face every day.
I have had many macs/displays that have had dead or stuck pixels in the past, but this is different.
It really angers me that this seems to be a degenerative problem and I hope in another few months it doesn't get worse or more numerous.
There is obviously a serious problem with these LCDs and at the risk of sounding cliche and pointless, Apple should address this issue and extend repair service for the replacement of these LCDs or at least Apple should change manufacturers and/or offer it's worn out, tried and true, but tired of the bs, apple customers, something...
P.S.
If you are reading this and haven't checked your screen for pixel problems, don't! Ignorance is truly bliss with this one.