reading that avsforums thread, they say you should run it for 100 hours straight with nothign but these colored slides/slideshow running before watching it to break it in and season the phosphors like saul said.
sounds like a major pain in the ace.
wondering if i should have gotten the LED.
Hope you are putting it into a dark room?! 
not real dark, not real light either. the panasonic plasmas have a matte finish on the screen, all should be fine.