Tweaks

Tbromgard, You can make grounding plug yourself for a couple bucks each. All parts are available from Radio Shack.

http://www.siteswithstyle.com/VoltSecond/Shorting_plug_rca/shorting_plug.html

All three of these tweaks are fairly standard, and well known actually.

Remember though that tweaks are just that, "tweaks", which are minor little adjustments to one's system, that may, or may not, affect the sound of the system. Try'em out and if they work, great. If not, no big deal, as most of these tweaks are relatively cheap to try out anyway.

Tbromgard: Here is a link to some grounding caps:
Music Direct-grounding caps

#1 I tried shorting pins and found no appreciable change. Make sure if you try this, not to insert said pin into an output jack. #2 Vibrapods made some difference but not huge and not always an improvement. Audio points and Still points are the real deal. #3 I would rather listen to Elton John (I dislike his music) than spend the time attempting to have cords intersect at right angles.

Suggestion for #4 Try some GIK panels in your room. They are reasonably priced.

Would really like to see if you can measure any difference for the suggested tweaks.

I have found that those tweaks work if your system is sufficiently resolving enough to hear them. Make your own grounding plugs as sidssp sugests. V-Pads (rubber-cork-rubber pads and available at HVAC suppliers for about $2.50)are MUCH better than Vibrapods and lots cheaper but Still Points and Mapleshade brass footers are even better.

I find it near impossible to get cords at 90 degrees to one another.
For well thought out system suggestions get Jim Smith's book "Get Better Sound" Worth every penny.
http://www.getbettersound.com/