I used to have a dozen devices back there, but I've been moving them around over the past several months. (Tivo in the server closet, now... no more Mini-ITX MP3 player...)
As a result, I had tons of cabling back there not hooked up to anything. I ended up unplugging everything, moving it around, and replugging it all in, complete with zip ties. I'm pretty happy with the result.
I used to have the TV in a corner with all the devices on a shelf in the triangluar space behind it, hidden away. Unfortunately, that made it a little cramped back there, and it was especially hard to get to the back of the receiver to make changes. I resorted to putting all the crap on top of the TV this time around which looks okay, but not great. At least all the devices have a "dim mode", except the red Dolby Digital light on the receiver.
Also means I don't have to walk behind the TV to put in a movie anymore, since the DVD player is on top now as well.
And now I know what cables I need to buy to get my Roku HD1000 working again. (I'd stolen its cables for something else previously)
Need an extra Tivo remote for the bedroom programmed to work with that TV. And another 30' or so of coax so I can get Tivo going in both the bedroom and living room without dragging the 70' cable between rooms. (Which in practice just didn't happen after the first novelty time...)
Oh, and another IR receiver / RF transmitter for extending the remote control signal to Tivo. I bought 2 of the wrong one, since they were just labelled "Receiver" and "Transmitter". Those are vague labels if you don't know if it's receiving IR or RF or transmitting IR or RF.