If you research IMAGE RETENTION PLASMA you find a few answers. But let's be clear that those that sell PLASMA downplay the issue. It's still there and if you use the set to play video games or watch ANY non-full-screen content I suggest you forget PLASMA.
My 2 cents.
I am wanting to purchase a 55 in TV. I am not sure if I should buy it now (2012 model) or wait till Jan. or Feb. when the new models arrive. Has anyone heard of any fantastic new features that will be added that would make me wait? I am considering the Panasonic P55VT50 or the Samsung 55ES7100. I know one is plasma and the other LED. Thanks