Been burning in my plasma for days now (VT65). Used the 6 minute loop found in the link below (top file), I find it's even better than D-Nice's slides, as it has more gradients and variations. I actually edited a custom version to make it longer (2 hours) so I could keep it on the loop for longer periods.
http://hdtelevizija.com/download/download-korisni-video-materijali/
On a side note, I've already noticed a slight difference in image quality after about 50 hours or so of burn in, and I'm pretty sure it's not just my imagination. I feel like shadow detail and grayscale gradients are more accurate. Pre-burn in, watching Master Chef, the female chef, Monica Galetti's face was overly dark and had a bit too much red/brown in it compared to my calibrated Pioneer Kuro plasma, even with semi calibrated settings.
Post semi burn in, her facial colouring and complexion is now essentially the same as the Pioneer downstairs. 4-5 more days till the ISF calibrator comes round, so I need to get the rest of the burn in done pronto lol.