The PC Guide - Excellent technical reference tool. Tons of details on various hardware components. Contains a procedure guide for installing and configuring various components as well as an extensive troubleshooting index.
Topic Index - Overall view of the inner pages of The PC Guide.
PC Lube and Tune - Articles and tutorials on different hardware components.
PC Mechanic - General information on motherboards, CPUs, memory, video, monitors, and hard drives. Includes BIOS beep codes. Motherboard and hard drive installation.
PC Tech Bytes - Tech information, how-to guides, and links to utilities.
The PC Technology Guide - An excellent detailed overview of all of the components inside a personal computer. Includes a nice glossary of computer terms.
PC Tech News - Handy searchable archive of usenet posts in hardware-oriented newsgroups.
System Optimization - Motherboard reviews and processor surveys. Information on motherboards, CPUs, chipsets, BIOS, cache, and memory. System benchmark surveys. Overclocking guide.
My Super PC - Specific product recommendations and where to get it for a good price along with links to product reviews and some assembly instructions.
Open Systems - Rather detailed general overview of components that go in a home-built machine.
PC Analysis - Computer Craft's guide on things to check on a non-functioning computer.
Google Groups - Search old newsgroup posts for a company name to see what others think about them. Be careful: people are often much more critical on usenet than at other sources.
The PC Guide: Buyer's Guide - Extensive look at computer hardware purchasing. Includes guides on criteria for choosing hardware components, how to evaluate and deal with hardware vendors, and avoiding and solving hardware buying problems.
Intel Official Site - Intel processors (486, OverDrive, Pentium, Pentium Pro, Pentium II, Pentium III, Celeron, Xeon, Itanium, Pentium 4, Pentium M, Core 2).
PC 80x86 Processors - Old (1995) but informative overview on the evolution of the 80x86 processor.
The PC Guide: Processors - Very detailed look at the various x86 processors. Includes details on voltages, multipliers, cooling requirements, sockets types, and more.
Power Leap Official Site - CPU adapters (PL/586-133, PL/54C, PL/OD54C, PL/54CMMX, PL/ProMMX, PL/K6-III, PL/PII, PL/Renaissance/AT, PL-Neo/370, PL-iP3, PL-P4).
The Overclocking Guide - Tom Pabst's aging guide to overclocking. Discusses heat and reliability issues as well as system performance benefits. Includes an extensive survey.
Overclocking Information - System Optimization's guide to overclocking. Includes overclocking FAQ.
The PC Guide: Motherboards - Very thorough overview of the single most important component inside a computer. Form factors, chipsets, L2 cache, IRQ's, BIOS configurations, etc.
PCI Chipset List - List of PCI-compliant chipsets (486, 586, and 686 compatibles).
Tweak It - Antiquated, yet thorough, motherboard benchmark tests along with motherboard specs.
Upgrading with the AMD K6 - c't article on the AMD K6. Contains a list of K6-compatible motherboards. Also has info on typical clock frequencies, voltages, and BF jumpers for Pentium MMX (P55C) and K6.
Phoenix Technologies Technical Specs - Various tech specs for BIOSes. Includes multiple-boot BIOS select, CD-ROM boot, Enhanced Disk Drive (Int13 Extensions), and USB specs.
TweakBIOS - Cool utility for tweaking a computer's BIOS settings.
Firmware Support Documents - Mostly BIOS upgrades, but some commentary on cable select jumpers, cluster size, Disk Manager and EZ Drive, LBA, drives bigger than 4GB, and the new partition type.
Gibson Research - Spinrite home and some info on the Iomega Zip and Jaz Click-of DeathTM.
Hard Drive Related Terms and Tricks - Erik van Straten's hard drive info page. Lots of issues concerning hard drives (LBA, DMA, PIO, FAT32, partitions, and much much more).
Hard Drive Related Tools - Erik van Straten's list of diagnostic and benchmark tools for hard drives.
Jan's PC Upgrade Problems Page - Some good info on common hard drive problems. Includes util to detect BIOS Int13h Extensions for hard drives greater than 8.4GB.
The PC Guide: Hard Disk Drives - Overview of the history of hard drives and their construction. Discussion on drive geometries and the many problems with BIOS limitations and large hard drives.
The PC Guide: RAID - Indepth look at RAID systems and their configuration.
Peter den Haan's EIDE Storage Page - Lots of information about IDE storage devices including the EIDE FAQ. Also has links to basic storage information, the 504MB barrier, Ultra ATA, and FAT32.
Note: Because reviews only sample one monitor of each type, you really can't get an overall view of the quality of a particular model. Compile multiple reviews of the same monitor to get a better idea of its quality. And be wary of ratings that include price as an important factor. This can often artificially inflate the 'quality' of an average or below-average monitor. Also follow comp.sys.ibm.pc.hardware.video for real life comparisons.