This question got sort of halfway to answering my question, but there have been a lot of changes to the Stack Exchange network in the past 2 years and some of the links referred to in there no longer work. Basically I want a place to ask questions like, say, "What remote should I buy if I have components x, y, z? or "How do I optimize my living room setup?" Does Stack Exchange have a site for that?
There is no such site yet, but Home Theater is a proposed site on area 51, so if this important to you, commit to it...