Tweak Your Own PC

Capsa Casemodding Community
A discussion forum to get help with or show off casemodding work.
http://www.capsa.dk/?lang=en

Guru3D
Reviews, analysis, drivers and tweaks for 3D graphics cards.
http://www.guru3d.com

[H]ard|OCP
Offers news and tips to help achieve maximum PC performance.
http://www.hardocp.com

The Lunch Box
Source of information to help increase the performance of a PC and extend its useful life.
http://www.geocities.com/_lunchbox/

MVKTech
Hardware tweaks, reviews and BIOS resource center.
http://www.mvktech.net

OCWorkBench
PC hardware news, articles, and reviews site with a large forum community for overclocking and tweaking.
http://www.ocworkbench.com/

Overclockers Forums
Highly active forum dedicated to overclocking Intel and AMD based PC's.
http://www.ocforums.com/

Overclockers.com
Overclocking enthusiast site that focuses on overclocking news, reviews, and practical advice on the cutting edge of PC performance.
http://www.overclockers.com

The PC Improvement News
Tips and tricks, and tech articles updated weekly.
http://pcin.net/help/articles/

PC Speed Up
How to guides for PC optimization and daily maintenance.
http://www.pc-speed-up.com

Speedy 3D - How To Section
How to guides for hardware installation, and computer and case modification.
http://www.speedy3d.com/articles#how-to

Tweakfactor
Articles about performance tuning of hardware and games.
http://www.tweakfactor.com

TweakTown
Reviews, articles and guides to tweak a computer system.
http://www.tweaktown.com/