Any HDTV tv is prone to screen burn, except DLP, which I can't afford.
The three easiest ways to reduce the chance of getting screen burn are:
1. keep brightness/contrast as low as you can tolerate
2. watch 4:3 programs in stretch mode
3. avoid any fixed images (channel logos) for long periods of time
I'm just curious what stretch mode looks like, since I'll be using it 100 percent of the time, for anything in 4:3.
PS, anyone tv users here ever get screen burn?
I gotta say, I've had 51" HD 16:9 TVs for the past 3 years, and no burn-in. I've also had the Sony tech for this region out a lot (due to a flicker problem that sony finally 'fessed up to being a mfgr flaw) and I was asking him about burn-in. He'd indicated he's never seen video game burn in, and the most common burn-in is from people who day-trade, and leave the channels with stock quote ticker bars up. They're leaving this image up for 8+ hours a day, 5 days a week.
Something else to consider : If you calibrate your set correctly (and there are products on the market that help you do this) you're less likely to get burn in. Default settings usually have the brightness and contrast cranked up, which forces more white on the screen. White is the fastest burn-in as it uses all 3 guns, and has a higher intensity than other colors. Black can also burn in though, and so some 4:3 aspect configurations for 16:9 tvs use gray, rather than black, as the side-bars. The gray isn't really being projected; its the absence of image that produces the color.
As to the stretch, you get used to it pretty quickly. if it bothers you, go to full mode where the top and bottom of the 4:3 picture are cut off... this also reduces the amount of onscreen static images, as you station logos tend to be on the bottom right side.