I'm having the same problems with purple vertical lines during the landscape browsing of white webpages. I'm really annoyed with this and I'm already ready to get rid of this device. These kind of problems with a 700 euros device is unbearable...

Yesterday I checked the sample webpage posted in this forum earlier with my girlfriend's SGS II and there were no visible purple lines. Based on this one (unrepresentative) test I would assume that the problem is not solely because of Amoled technology. This suggests that the problem is caused by pentile matrix technology or software and only the last one of these can be fixed afterwards.

Now I'm really pissed about the fact that I gave Nokia a one more chance!