i finally decided to buy a monster power ac line conditioner the other day after reading these articles and asking around:

http://www.firingsquad.com/hardware/building_gaming_opteron_2003_Part1/page9.asp
http://www.firingsquad.com/hardware/2d_picture_quality_quicklook/page2.asp

and i wanted to simply say it makes the biggest difference i've ever seen. i plugged my home workstation and tv/amp/tivo etc into it and immediately could tell the picture was clearer on both the tv and monitor. i've never had any complaints about my home audio quality... but there was a serious improvement there too. i bought the least expensive model: HTS 1000 MKII

it was $89 from avstreet.com (use froogle) and can support up to 1875W of equipment, which means it's getting my workstation, monitor, tv, amp, tivo and everything else nearby.

2775 joule rating provides a high level of surge absorption.
$250,000 Connected Equipment Warranty.
Extra-long 8ft PowerLine® 200 AC power cord.
24k gold contact plug for maximum corrosion resistance and power transfer.
12 outlets for AC surge protection.
3 ultra-low loss, protected coaxial connections for cable TV/HDTV.
1 pair of protected phone/network connections for satellite/TiVo/phone/network surge protection.
Monster Clean PowerTM Stage 2 v.2.0 circuitry filter dramatically reduces electronic noise.
Tri-Mode power protection circuitry with audible alarm and auto disconnect.