I own a Panasonic TH-42PX60 (2006) and I’m very pleased with my set.
The first months (first 100 hours and 200 hours) is the time to use Plasmas with most care since the phosphors are their strongest during their youth causing more noticeable image retention but not permanent.
For the first months, keep in mind not to overboost your settings, like brightness, sharpness and stuff… keep it at moderate levels in the early days.
Downloading and burning an ISO of a Break-In DVD is recommended for clearing up early possible image retention and also age the TV by running it in loop.
By aging the TV, the phosphors get used and you will notice Image Retention will no longer be as much of a concern.
Today, I play all sorts of games with Health Bars and Huds and I am now well passed my break-in period and I have no trouble with IR. If I play or watch a movie with border for long periods of time, I remedy the situation by playing a full screen video or use my break-in DVD to cleanse it up.
You may get freaked out in the first hours of your set’s first youthful hours, but after you get past your break-in period you should be in the comfort zone and not need worrying.
Ridge Racer 7 on PS3 was the first game I tried out on my set, when it was young, there was Image Retention of the HUD. and I was freaked out… Now today, I don’t have burn in like that anymore with Huds or Energy bars… and if I do have some, it is minimal and easily remedied with a full screen looping video.
here is a link to the AVS forum with more techy info about it: