I'm experiencing some stubborn IR as well.
The Netflix logo via the PS3 Netflix app. Even 15 minutes of that static logo wreaks havoc on the upper left part of the screen. I've run the scrolling bar and various "burn in fixes" on youtube, but there is still faint lines on the screen.
I guess I should buy that Disney WOW blu-ray and try the pixel flipper.
Also, how are people keeping track of the amount of time their set has been on? Is there something in the menus...