Besides, burn-in isn't the issue it used to be, even on plasmas,
In my personal experience (GF just got a brand new plasma), burn-in is just as big an issue on plasmas as it used to be on CRT projectors. It happens, it happens quickly, and you have to be careful with it. She had black bar burn-in within days of getting her TV.
and even if it were, 20 seconds of a static image wouldn't be enough to do anything.
No, but a few minutes of the same image, repeated over a long period of time (doesn't matter if it's consecutive minutes or not) can be. Flipping the image left and right at 20 second intervals just means you're burning two separate images at 50 percent of the time, instead of one image at 100 percent time.
I agree that putting on a scrolling photo screen saver after a couple of minutes goes a long way to take care of the issue. But if someone plays a lot of MP3s, leaves the TV on, and keeps canceling the screen saver by hitting the "skip track" button, it could become an issue.
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