I mounted our 40" Sammy over our fireplace. I have been up in the attic of our new place twice for other reasons and don't want to do it again until the temps cool off some.
I have a few ideas about how I am going to run power, but without knowing EXACTLY where our entertainment gear will go I dont know what cables to buy. I already have a 25' DVI>HDMI cable and suppose that I should just 'pre-pull' a few HDMIs, a component, S-video, and a few audio pairs. I think that what I will do is mount a clock receptacle behind the TV for power and then romex over to the outlet below (or a dedicated clock receptacle since I am also adding a new 200A box) I would prefer to keep from tearing up the wall, but I may just cut it open, notch studs and run a PVC pipe up the wall so that I can pull easier in the future, if needed.
I am still brainstorming but am just curious what folks here are doing.