I just got a pn58b550 on sale at Best Buy (gotta love no interest financing), and it has the line bleed issue. Spoke to Samsung, and they pointed me to a specific post on their site, which mentions dead pixels, line banding, etc. According to the article, once you've checked your source(s) to verify it's the tv, Samsung recommends filing a service ticket. I'd post the link, but I'm new here. Anyway, annother commenter mentioned Samsung saying line bleed is normal, but I was definitely told that it was not, and as the article mentions, it's likely a problem with the image buffer. Anyone having this issue on a Samsung plasma would probably do well by submitting a service request (assuming it's under warranty), though I'm considering just returning the set and finding a similar LCD in my price range. Quite frankly, while the picture on this set is quite good, I'm getting a little annoyed by how much "babying" plasma sets require. My last set (Samsung LCD ln40b550) didn't have a break-in period, no line bleeding, no image retention, etc. I guess in summary, it makes sense that plasma is on the way out.