Spaghetti cabling behind entertainment center

As far as keeping cables off the rug or floor, I've done that but notice no change.  I'm not saying there isn't one, just that it doesn't matter to my ears.  Try it yourself.  Use paper cups, or something like that to lift the cables and see if you hear a difference.  I use small wooden dowels with a wire tie to hold them together in a tripod fashion to lift cables over others.  Now that I think about it, I still have those ceramic insulators.

Keep power and digital cables as physically separated from other wires as possible, especially anything running from a phono.  Use shielded ICs if in doubt.   Plug power amp units directly into wall, no power conditioner, separate outlets from others if possible.  Separate circuits even better if possible.   Use good quality power cables designed to shield noise with digital devices in particular.  Can only help with pre-amp and power amps as well.  

The only locking plugs I use are for my speakers, as I have real 8 awg speaker wire, I needed bananas to fit the 7mm wire and 9mm jacket.  I use those nakamichi cheapo ones.  No, they don't get picked up by my magnet, so they're not made of iron. 

Anyway, when the preamp comes Thursday night, I will reroute all my cables, and keep the power cords separated from the rest.   Thank you guys, much appreciated!!!!!!!   !!! !!!!!

I try to run cables so they at least are not tangled around each other.
this is much harder to do since cables have become so thick and inflexible that just keeping them from pulling and pushing on the components in the rack is a real challenge.  
    If i were building interconnects (and even power cords) i would try to put them on "a diet" while maintaining good insulation from the environment.  
   Oh and one of the WORST scenarios are the twist-lock RCA cables that are
so difficult to put on and remove due to the lack of space for your fingers between
input receptacles on many components, especially preamps.

Arctikdeth, It is not a waste of time and money if you value the improvements you get. I built a Live End/Dead End room once. That was a major waste of time and money for me.

Ok;

keep ep all power cords together and away from others.  Don't let them touch other cables, rca' or hdmi's. 

Dont  let touch the floor? Vibrations? Or put some ceramic tile behind entertainment center on floor? Or waste of time & money?

I would also hasten to add that no cables should be in contact with the floor or carpet. It is best if you have ceramic isolators holding them off the floor. Metal and even wood are insufficient.

Were you to see my setup, you would think you have no problem, but I have no cables touching the floor and have them crossing at sharp angles, 

Ok, isolate the power cords from every component.  Will do, I will tie them together, and try to get as far away from RCA's hdmi's as I can. Thank you

  I just do my best keeping the AC power cables away from the rest.  The DC cables don't seem to make a difference where they are, but I try to keep them separate.  I have a pic in my system page.

Firs off, don't bunch or tie your cables together. Try to get them to cross at right angles if and when they do come together.

You can also go one step further and get some sections of foam tubing used inside pipes that has a slit along the length of it. Just cut some very short sections from it and using the slit, wrap it around a cable and place it so it rests between it and any other cable you're worried about.

If you want that Scandinavian look of neatness, you're in the wrong hobby. :-) Old timers like me take a certain satisfaction in the tangled mess that resides behind our rigs, jutting out here and there, clearly the work of some bedeviled fool.

All the best,
Nonoise

IKEA makes these cable management boxes:

http://www.ikea.com/us/en/catalog/products/30198028/

Wire ties?