defragger:IronH: welcome to one of the flaws of AMOLED screens. It's a pretty common problem (google "AMOLED black splotches or blobs"). My S2 also had that issue though with only two splotches and was only visible in the dark with black backgrounds.
Yeah, the spots on my phone are pretty bad. Some long lines going across the screen. I'll try to get a replacement and hopefully there are no issues. Don't mind waiting.
Yeah this simply the glue.that being used unevenly. You may have an unlucky draw. My S2 got this on the edges and some small blobs when viewing black in the dark. But I doubt that you'd get a replacement from Samsung, you might be the lucky one to get a new one. :)
I hope my S3 won't be like this.