Plasma's prone to burn-in in video games.
Here are a few good articles.
Plasma especially, but even a lot of older rear projection tv's still have a problem.
But most have really worked out this issue.
Really? I'm still leery because if you get burn in, you're screwed. There's no way to fix it, right?
Yeah pretty much, you have to really research the model that you have, it can vary.
But the burn in happens because the avatars/icons/HUD are exposed in one location for a very long time. Look at a Wawa or 7-11 register display, or an old ATM display. BURN IN
How long does that take though, an hour, 3 hours, 7 hours? doesn't it take a real extended time, like days?
This will vary depending on brand, model, screen types. It's just a lot less an issue for newer systems
Without admitting exactly how long I can (and have) played Morrowind, I'll venture to say even a newer plasma isn't a chance I would take. :P We're happy with our huge, 150 lb tube right now.