Cheap tweaks...What would YOU reccomend?

In Stereophile a LONG while ago, the guy from Holland was talking about using "antistatic foam" (from like RadioShack used to protect chips from static damage) inside the boxes of D/A and transport stuff. The idea is to capture the stray EMF and ground it. I have used the stuff in my Adcom DA600 and DA700 with success. It does give a quieter background and a cleaner upper frequency range. I would cover the foam with a thin cardboard (Pepsi/Coke cardboard 12pack stuff) and slide the stuff under the circuit boards and over the chipsets on the boards. Also between the different sections of the circuitry.

If you wear glasses,take them off when seriously listening in the sweetspot.Maybe it's psychological...i also suggest the auric illuminator cd treatment.With some cd's,the difference is not unlike upgrading a component.

The cheapest I can think of is to close your eyes. You can focus better on the music. Secondly, people walking around the house degrades the experience. (That breathing, it's so repetitve ... ha, ha, ha!) Many things have aleady been mentioned, so I won't repeat.

Hmm, I clean my connections. I havent' perceived a difference, but I believe it makes a difference. I put in new speaker wire and interconnect wire. That made a very perceptible change in the system. (It was still a cheap tweak, believe it or not.)

Tweeks I haven't had the nerve to try yet. Greg Weaver of Soundstage.com recommends freezing your CD's. Heck, I'll try it someday, but I'm stillll skeptical.

I've done two cheap tweaks that dramatically improved my system lately.

1) elevating my amp by placing a phone book beneath it.
-There is a night and day difference in bass extension. The bass is flat before the presence of the phone book. After, the bass is more deeper, controlled and permeates the room in an almost waves like manner.

2) spent $40 bucks purchasing 2 sheets of Dynamat Extreme from Carmedia1.com and tacked it on the bottom of my shelves. This transformed my shelves from a "scat scat" to a "thonk thonk" when knocking on it. The aural improvement is equivalent to swapping to slightly higher end power cords in the digital front ends.
-The highs and "digital" harshness is tamed a few degrees. Before, the highs hurt my ears if I played over the "55" setting on my digital preamp for over ten minutes. After, I can play up to "65" without ear fatigue.

any suggestions or feedback on upgrading speaker jumpers?
Any brands better than others?