I have a plasma and I can say that is some STONE COLD BULLSHIT
I played street fighter for like 3 hours yesterday and that game has like a HOJILLION stationary things on the screen and I ahve no adverse effects.
It's really not bullshit, just an exaggeration. POR EJEMPLO, stuff like ESPN will stay on your TV for a while when you first get it (like first 100 or so hours of use), so it's kind of somart to turn its settings down or something if you plan on watching football all day. Then again, new plasmas probably have fancy solutions for this.