I have to agree, the Panasonics really do seem to be very resistant to screen burn.
Not that they wouldn't "burn in" eventually, as constant use in one area still wears etc.
I always insist friends and family buy Panasonic plasmas, and up to now, not a single one has ANY type of screen burn.
S&V also reported that they left a Panasonic 42" showing a static DVD logo on during a four day period (over the long bank holiday). Thinking the screen must have been ruined, they were relieved find zero image burn or retention!
To make sure, they run the white bar scrubber for a few minutes, then put on normal test films.
I do see image retention on other brands of plasma, but again no permanent damage.
The only screen burn i have seen is on commercial displays, at cinemas/airports etc.
I think everybody agrees, a safe bet is to "run" the screen in for a least 100 hours on low contrast settings, avoiding static images etc.
I have now even stopped pressing "Back-up" on the Sky remote to remove the red dot. But i don't tend to watch a channel for very long anyway!!!