
just thought it might be worth mentioning that for sets above 37 inches Plasma is preferred over LCD
http://www.plasma-lcd-facts.co.uk/
been researching this myself as my old Sony 32" crt has been slowly dying on me

The good news is that for the past couple of years quality manufacturers have been steadily working on improving plasma technology resistance to "burn in" with great success. One technique used is motion adaptive anti burn in technology, which focuses on moving the on-screen image ever so slightly. The goal is to avoid detection by the human eye, but still move the image enough to cause color changes in the pixels. A second improvement by some manufacturers is improvement in the phosphor gas itself in order to make it more resistant. The green phosphor is the most important in this process. This is also a key element in increasing phosphor and screen lifespan to CRT levels.
As a result of these advancements, a couple of prominent manufacturers now claim that plasma TVs have the same burn in resistance and susceptibility as CRT TVs. When was the last time you heard someone say that they were concerned about image burn in on their tube TV? Never?
But to digress, burn in, simply put, is a damaged pixel, whose phosphors have been prematurely aged and therefore glow less intensely than those of surrounding pixels on the plasma TV screen. The damaged or "burned in" pixel has developed a "memory" of the color information that was repeatedly fed to it in a static manner over a period of time. And that phosphor color information has actually become seared or etched into the plasma TV glass. Hence the term, "burn-in." Once these phosphors are damaged, they cannot give the same output as the other phosphors around them do. But pixels do not suffer burn-in singly. Burn-in occurs in the shape of a static image that persists on TV screens -- things like network logos, computer icons, Internet browser frames, or an entire image that has been displayed in a static manner etc. Network logos were a problem initially but they have now become sensitive to the problem and have also adapted a motion logo technology which prevents burn in.