General computer references - all are very good resources
http://www.ultratech-llc.com/KB/?File=!Contents.TXT Ultratech Knowledgebase
http://www.ultratech-llc.com/BrainWave/TechDocs/TechDocs.html Ultratech/Brainwave Tech Documents
http://technet.microsoft.com/ Microsoft Technet
http://www.pc-help.org/ PC Help
http://mvps.org/ A collection of Microsoft Most Valuable Professional (MVP) websites
http://msmvps.com/bradley/ E-Bitz - SBS MVP the Official Blog of the SBS "Diva" - This is the weblog of Susan Bradley, I don't run MS Small Business Server, but this is very useful. She posts frequently in the PatchManagament.org discussion groups, and has some very wise counsel on how to keep a handle on software updates.
http://msmvps.com/giggs/ I need to check this guy's website out.  Looks promising.
http://lists.gpick.com/ List of Lists
http://www.techrepublic.com/ Tech Republic
http://www.eventid.net/ Excellent resource for figuring out some obscure windows event log entry
http://www.ultimatewindowssecurity.com/encyclopedia.html"Plain English" definitions of events in the Event Log.
http://www.windowsitpro.com/windowsnt20002003faq/ John Savill's FAQ for Windows
http://petri.co.il/ Daniel Petri- very nice knowledge base.
http://www.1wit.com/ Frank Bernard's website - he frequents the Vamsoft ORF newgroups and is very knowledgeable about SMTP email systems, among other things.
http://www.dougknox.com/ MS MVP - Various XP utilities, fixes and other tidbits
http://www.connectedhomemag.com
http://aumha.org - MS MVP
http://aumha.org/win5/a/wpa.php - Excellent description of how XP activation works.  Very good read.
http://www.afinion.de/english/Products/PoW/APV_2_6.php File viewer for MS Project and SAP PS (free and paid versions).  Allows viewing of these files, I have not tried this.
http://www.geekswithblogs.net/dtotzke/articles/26204.aspx How to print to a USB Printer from DOS in Windows XP (un tested)
http://www.microsoft.com/downloads/details.aspx?FamilyID=b4cb2678-dafb-4e30-b2da-b8814fe2da5a&DisplayLang=en TechNet Script Center Sample Scripts for System Administration.

FTP - General
http://slacksite.com/other/ftp.html Active vs Passive FTP:

Other
http://www.sengpielaudio.com/calculatorBits.htm Conversion: bits and bytes
http://public.kvalley.com/regex/regex.asp A great regex builder for Vamsoft's Open Relay Filter (mail server spam software)

Hardware
http://www.ata-atapi.com IDE/EIDE/ATAPI host bus adapters
http://www.pcguide.com/ref/hdd/if/ide/conf_CS.htm IDE/EIDE/ATAPI host bus adapters
http://www.comsol.net.au/scsi_conn.asp SCSI Connector Reference Guide

Other - need to research further
http://www.samurize.com/ Desktop "gauges" CPU, network utilization, uptime, etc
http://www.coolmon.org/ Sort of like BGinfo from http://www.sysinternals.com/.
http://logi.cc/nw/NetCalc.php3 IP Address / Mask converter

Bug Traq http://www.ntbugtraq.com I have not used this since about 2001. I need to check Sunbelt Software's NTSYSADMIN archives, a thread mentioned why the quality had decreased for this resource, but I forgot.