Applications:

Ad-Aware (by Lavasoft) - removes ad-ware and spy-ware
BLAT for Windows - send email from the command line
Microsoft Anti-Virus - MS's first foray into removing spyware and adware
Spybot - Search & Destroy - removes ad-ware and spy-ware
SysInternals - several useful admin & debug tools
Treesize (& other tools) - Details HDD space usage.

Knowledge Bases:

C# - See my C# specific list here
ASP.Net
JSI FAQ - Tips & Tricks for Windows NT/2000/XP/2003
MSDN Magazine - The Microsoft Journal for Developers
Security @ Microsoft.com - Security updates, recent incidents, anti-spyware & tips for how to be more secure.

last updated: 2.25.2005