TweakXP (www.tweakxp.com): Affiliated with the Tweak-XP utility discussed above, this site is dedicated to helping users get the most out of Windows XP. Most of the data is raw and lacks sufficient explanation, but the site is updated frequently with tips and tweaks of all natures.

Windows Guide Network (www.winguides.com): Great stuff about security, registry editing, tweaking third party apps, and more can be found here.

TweakTown (www.tweaktown.com): One of the first sites to post a complete XP tweaking guide, TweakTown is full of genuinely useful information for all manner of hardware and technical stuff.

Blink Windows XP (www.windowsxp.nu): Its scattershot approach to good information and fluff produces some great nuggets of info. This site also has a huge list of XP-related links.

Microsoft TechNet Online: (www.microsoft.com/technet/): More WinXP stuff is appearing every day, in very raw technical form.

XP PowerToys The latest token PowerToys collection.