Had my MBP since October of '07. Had a minor issues with the screen, but after taking it into an Apple Auth. repair shop, it was fixed up within about 2 hours.
The issue was that on the far left of the screen, I would get alternating red/green/yellow/blue stripes. Not the issue that i believe you're reporting, but still, an issue.
This would only occur when I was gripping the lid of my MBP to close it. It seems that I always closed using my left hand, and this eventually led to something coming loose in there. They replaced the entire display unit and it was looking perfect the next time I booted up.
All told, nothing major. And, as the biggest test of my satisfaction with it, I can honestly say that I will never buy another style of notebook after using this.