6-12 months after I got my mbp in mid-09 I noticed this ring around the center of the lcd. It's gotten progressively worse. I can see the ring no matter the ambient light conditions or brightness setting.. and I'm also noticing some "ghosting" around the edges of the screeen when screen is blacker. the logo ring is most noticeable when screen is blacker. Maybe the light coming in from the back (maybe sunlight?) damaged the back of the display, or maybe it's that white ring of white plastic that gives the logo it's color.