Ok, though on this for a while, and here is all I could come up with. I apologize that some of these are duplicates from others, but I didn't feel like parsing this list down!
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Spyware cleaner links for Ad-Aware, Spybot, Search&Destroy. Mention these are for spyware/malware removal and/or browser hijacking fixing.
Then state if those tools don't work, then get HijackThis (with a link). Also add a link to how to read the HijackThis log; plus a link to the Browser Helper Object (BHO) page.
Also mention that some spyware (the CoolWebSearch family) needs CWShredder to remove it (with a link).
Links to popup blockers (Google toolbar, MSN toolbar, etc.)
Links to online virus scans (Symantec, Panda, TrendMicro, Mcafee). Also link to the search pages of the antivirus vendors, so people can look up their own viruses.
Reset Windows Admin password with pay tools (Winternals ERD Commander). Mention that there are freeware tools to do this, but don't list them by name, since they are totally unsupported tools that cause more problems then they fix!
How to clear the CMOS password.
How to remove IE Content Advisor password.
How to network Win98 and WinXP (mapping a drive between them).
How to stop Exchange from being an open relay. Also, how to add an e-mail signature to all outbound e-mails in Exchange.
What Active Directory is for, how you install/uninstall it, and why you can't have it when you still have NT4 PDC around.
How to secure IIS webserver with the IIS Lockdown tool, and why you need to with IIS out of the box.
Links to vendor certification sites (Microsoft, Cisco, Checkpoint, etc) for cert info.
List all the places in Windows a program can be run from automatically (the different Run portions of the Registry, as a Service, as a Scheduled Task, the Startup folder, Autoexec.bat, etc.)
How to move/export e-mail from Outlook Express.
Differences between a hub, a switch, and a router, and why all are useful.
Links to penetration/vulnerability tools for testing your own security. Don't link to wacky (but very interesting!) freeware tools. Try and stick with professional things like Nessus (which is free, but not wacky!), eEye Retina, and the one from ISS (I forget its name right now).
My favorite one to answer: Technet article 180094, "How to Write an LMHOSTS File for Domain Validation and Other Name Resolution Issues." Amazing how useful this one stil is!
Links to bootdisk.com for bootdisks (obviously).