Mac/PC Compatibility:

Macwindows.com - Mac / PC networking, Mac floppies on PC, sharing printers, tutorials.
Andy McFadden's CD, www.cdrfaq.org - Recordable FAQ,
DVD Demystified, find.pcworld.com/35876

Linux:

Linux Online, find.pcworld.com/36215 - First stop for any novice, tutorials for almost every Linux distribution.
The Linux Documentation Project, www.tidp.org - Designed for experts but with plenty for newcomers.
LinuxQuestions.org - Geeks help geeks by answering specific questions.
Google Groups Linux, comp.os.linux, find.pcworld/35732

Community:

VolunteerMatch.org - Virtual VOlunteering
Coalescence, find.pcworld.com/35756
WebJunction, find.pcworld.com/35759

Privacy:

Privacy Rights Clearinghouse, www.privacyrights.org - One-stop destination for advice on all sorts of privacy issues, from identity theft to other privacy invasions.
Health Privacy Project, www.healthprivacy.org - Watchdog group shows you how to protect your privacy.
JunkBusters.com, www.junkbusters.com - Dr Jason Catlett and his site fight spammers, telemarketers, indifferent ISPs, and other who spread junk.
Identity Theft Resource Center, www.idtheftcenter.org - Help fight identity theft.
Internet Privacy for Dummies, find.pcworld.com/35933 - SIte tied to the book o fth esame name.
Nua, www.nua.com/surveys - Surveys on just about any business aread that interscts the Web.
Consumer WebWatch, www.consumerwebwatch.org - Grant-funded project of Consumers Union, nonprofit publisher of COnsumer Reports.

Business Related:

The Small Business Administration, find.pcworld.com/35693
Businessplans.org
NASA
Bulletproofbizplans.com
CCH Business Owner's Toolkit

Web Radio:

LaunchCast, find.pcworld.com/35879
BBC Radio Player, www.bbc.co.uk
All Music Guiode, www.allmusic.com

Data Management:

dtSearch Desktop 60, www.dtsearch.com, $199 direct
direct80-20, Rectriever 2.6 SPI, www.80-20.com, $49.95 direct
Enfish Professional beta, www.enfish.com, $99.95 list
Scopeware Vision Professional beta, www.scopeware.com, $79.95 direct
Six Degrees, www2.creo.com/sixdegrees, $149 direct

File Directory Management:

Fast Directory Finder
V-Com's PowerDesk $40
Nikos Bozinis' 2xExplorer
Right-mouse button freeware tools:
RJH SOftware's RJH Extensions
Moon Software's FileTargets

Specifically for Broadband Users:

IFilm, www.ifilm.com
TFN FanFilms, find.pcworld.com/35936
Musicmatch MX, www.musicmatch.com/mx
TVparty, www.tvparty.com
All Day Breakfast, www.alldaybreakfast.ca

Browser Add-Ons:

Cool Flash Player Manager, www.siskinsoft.com, Free - Snatch animations from your browser's cache.
IP Search Toolbar, find.pcworld.com/35927 - Fetch IP address, run a Whoise search, ping, sync your pc clock.
Favorties to HTML - This allows you to share your IE favorites with others.
Teleport Pro, find.pcworld/35930 - Browse offline, capture pages based on a word search or file type.
IDcide Privacy Companion, find.pcworld/35873 - Lets you know if a Web site is tracking you and blocks the offending party.e

Computer Help:

Brian's Buzz, www.briansbuzz.com - Brian Livingston, windows tips.
Outlook & Exchange Solutions Center, www.slipstick.com - Features how tos, fixes, patches, utilities.
Black Viper, www.blackviper.com - For Windows and Linux installationi guides, and general PC tips.
AnandTech, www.anandtech.com -
Arstechnica.com -

PDAs:

Dave's PDA Place, www.davespda.com - Reviews, FAQs on Palm and Pocket PCs.
Brighthand.com - Palm and Pocket PC, news, forums, interviews.
CEWIndows.NET -Audio, video, battery life, wireless issues.
CeBeans, www.cebeans.com - Pocket PC freeware

Build you own PC Tools:

Mysuperpc.com - Step by step intructions and is constatnly update with recommendations about specific pastrs.
PC Mechanic, www.pcmech.com/byopc - Offers a 27 step guide to getting the job done.
Buildpc.net - Which has a few videos
Waterwheel.com - Which displays tons of photos
Hardcoreware - Which takes you step by step through building a completely silent pc.