What are some thoughts here about mounting TVs above fireplaces? Conventional wisdom (and any quick Google search) will tell you not to do it. However, I'm still hoping to do this once I get a larger OLED later in the year. One consideration is that I have a gas fireplace. So while heat is an issue, soot or smoke is not. I tend not to run the fireplace for hours at a time, the way you have to with a real wood-burner. It's always on the lowest flame setting but does generate a fair amount of heat.
I also plan to remove the mantle I have now and mount a new one that is deeper (thus deflecting the rising heat around the TV a bit more) and lower (for a better viewing angle). I've had a 46" plasma on a stand at eye level for 8 years now, and I really love having it at that level. However, in order to get a bigger size that I want (aiming for 65") the only other real option is above the fireplace. Currently the smaller TV is off to the side of the fireplace and the TV takes up nearly all the space between the fireplace and the corner of the room - no way to fit a 65er there. (I'll try to post pics later).
tl;dr -- OLEDs above a gas fireplace? Major bad? OK?