Have you tried putting it on a channel with just snowy static for 1/2 hour. I've heard that can help with image retention. Obviously it may not do as much or anything for burn-in.
There's some interesting stuff on this site although it is a commercial site...
http://www.plasmasaver.com/burnin.html
Quote:
How Many Plasma Users Experience Burn-In?
In fact, not many. Recent technologies make modern plasma displays much more resistant to permanent image retention. A research sponsored by Pioneer Electronics demonstrates that leaving a static image for 48 hours did cause a clearly visible image retention on all three of their test plasmas, but running a movie loop for 24 hours removed all signs of the after-image.
However, it is still possible to burn a plasma if it is used to display static images, such as black side bars, for extended periods of time without varying viewing material. Channel or computer game logos are also likely lo leave an after-image.
PlasmaSaver DVD helps to prevent permanent image retention by running your plasma in full-screen mode in an infinite loop. It can be also used to wash out any signs of temporary image retention caused by the prolonged display of static images.
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