OptimizeXP eBook - eBook that shows step-by-step procedures to speed up and optimize Windows XP. - http://www.optimizexp.net/
Windows XP Services Tweak Guide - A step by step guide to tweaking Windows XP Services. - http://members.internettrash.com/megapolon/winxptweak.html
Tweak.us - Tweaks for Windows XP with step-by-step explanations. Also suitable for beginners. - http://www.tweak.us
TLab404 - Customisation and performance tweaks for Windows 2000, XP and Server 2003. - http://www.tlab404.com/
Running IIS on XP Home Edition - A step by step tutorial about how to run IIS on Windows XP Home Edition. - http://www.xfriday.com/xp_home_iis_problem.asp
XP Smoker - A tweaking utility for reducing system bottlenecks, increasing speed and deleting unnecessary services. Trial version available for download. - http://www.xp-smoker.com
Optimize XP - A guide to improve system performance with the Windows XP operating system. - http://mywebpages.comcast.net/SupportCD/OptimizeXP.html
Tweak Internals - Provides software for tweaking and optimizing Windows XP. - http://www.tweakinternals.com
MusicXP.net - Advice and guidance on optimizing Windows XP for professional audio and music applications. - http://www.musicxp.net/
XP Product Key Modifier - Application written to automate the task of changing the product key in Windows XP. - http://ryan.ript.net/xppid/
Tweaking Toolbox XP - A program designed to improve security, appearance and performance of Windows XP [Internet Explorer required]. - http://www.tweakingtoolbox.com/tt-xp/
WinXpFix.com - Tips and tweaks, partially organized by topics. Includes news and articles. - http://www.winxpfix.com/
MagicTweak - Program designed to optimize and personalize Microsoft Windows. - http://www.magictweak.com/
TweakXP.com - Dedicated to improving and customizing XP. Tweaks are for the user interface, system performance, and the internet. - http://www.tweakxp.com/tweakxp/
Windows XP Tweak Guide - Provides an extensive range of registry tweaks, tricks and hacks for optimizing and tweaking the Windows XP operating system. - http://www.winguides.com/windowsxp/