Overclocking: The Dissenting Opinion 
Provides an introduction to overclocking with sections on the benefits and risks associated with overclocking and whether or not your should overclock. This page is from "The PC Guide."
Maximum Hardware - Computer Hardware Performance Site
Offers a collection of up-to-date information relevant to computer hardware performance. The site includes product information and news, a BIOS upgrade guide, performance reports, links to related sites, information about 3D games, and articles on video accelerators, motherboards, and overclocking.
Overclocking FAQ
Compiled from the comp.sys.ibm.pc.hardware.chips newsgroup, this page offers answers to general questions about overclocking, including potential dangers and solutions.
SysOpt
A system optimization community. News and forums for technology professionals who are obsessed with achieving maximum performance.
Unlocking the Multiplier, Part 2
Takes a close look at the way 'remarkers' unlock or change the multiplier lock and manage to sell CPUs originally rated at much lower speeds.This tutorial is provided by HardwareCentral.com.