Cheap tweaks...What would YOU reccomend?

If you haven't replaced your receptacles at the wall (or in your line conditioner if you have one), I'd strongly recommend the Arrow Hart 8200 (available for about $8 U.S.) If you have two or 3 receptacles that your system is drawing from, this will make a very worthwhile improvement to sound quality. I also like the vibrapods (bear in mind that I have a relatively modest system and we are talking about "cheap" tweaks) and use them under both electronics and speakers (floorstanders). If you have a budget CD player, you might want to experiment with damping the interior of the casing (commercial industrial floor tile attached with double sided heavy duty carpet tape works well); I've had good results doing this. All of these are sub $20-$25 tweaks ( a little more if you start piling on the vibrapods), which I figure is pretty cheap.

Morasp:
Do you have any particular brand preference for the antistatic spray?Thks

The best and cheapest tweak you can do is speaker placement. Experiment with moving your speakers away from the back and side wall. Aiming them to face in front of you or behind you. If you have floor standing speakers lifting them off the floor a few inches can make a considerable difference.

Mod Squad "Soft Shoes" under my DVD/CD player. For less than $50 I got what sounds like a component upgrade.

I accidentally found this on my decent preamp, I was trying to use 2 "Y" connectors from my CD player to connect 1 set of interconnects to preamp "TAPE", second set to a HT receiver, but instead I hooked it into preamp "AUX1".
(I was in the process of doing it and got interrupted with something else for couple days).

When turn on preamp with BOTH "TAPE" AND "AUX1" on, the sound is .. drasmatically changed, with unbelievable detail, image, even loudness.

Just about to post as question if this is a mistake, but I enjoy it so much that I decide to keep it this way, maybe until something ... explode !