Well it wouldn't have been a problem with an LCD but there are various reasons I went plasma (latency, viewing angle, response time, black level).
The TV is still in its first 50-60 hours. Is it true that it will be less susceptible to IR after it gets a few hundred hours on it? I play RPG games and the like many of which will have HUDs, possibly bright ones. Now I shouldn't be playing any one of these long enough to cause dreaded burn-in (like someone who played Madden for hundreds of hours talked about), an actual significant difference in the aging of the phosphors, but it would be nice not to have bad IR after a gaming binge.
Luckily the game I am 'breaking in' the TV with, Fable 3, doesn't have a static HUD of any kind. I just have to not to leave it paused, or sitting in one spot (white text comes up reminding you what to do).