Ok, I'm weighing the pros and cons of mounting a LCD over my fireplace.
I checked the temperature with a roaring fire, and after several hours the wall was still cool to the touch.
Here's where I'm looking to put it: (Pardon the clutter, please.)

The paint in the room is much better than it looks in the image above. The flash from the camera is reflecting off the built-ins.
The big brown thing is a cardboard mockup of a 52" LCD. (Toshiba 52LX177 to be precise.)
I'd use the built-in on the right as an equipment cabinet.
This would really help the layout of the room. We'd replace the couch & loveseat (which are in dire need of replacing) with a reclining sectional. At a 10' viewing distance, this frees up a lot of area in the back of the room.
Here's the left wall, where the 'old' 32" SDTV is now.

On the right (North) wall, there are two north facing windows.

My default plan is to put the new 52" LCD on the wall where the old 32" is now. The major flaw with this is that there can be some reflections from the windows during the day, and from the lamps in the evening. I believe the 52LX177 has a matte screen, so maybe this won't matter.
Issues:
I don't have a good place to put a center channel speaker. I have a nice one now and it's too deep to set on the mantle.
I'm worried about the height. I'll give it a good test this evening and see if it feels comfortable.