Infos, FAQs, and other security-related sites
DSLReports Security FAQ
Spywarewarrior.com - good site, lots of info.
CERT Vulnerability database - Information on security vulnerabilities in various software.
SecurityFocus
benedelman.org - Homepage of spyware researcher Ben Edelman. There's some very enlightening info here.
CastleCops Startup List - Info on various run-on-startup tasks.
CastleCops Malware Removal and Prevention wiki
ProcessLibrary - Find info on what those processes running in your task manager are.
Forums
WoW customer service forum sticky: Account Compromise Info Center - Start here if you've been hacked.
DSL Reports Cleanup forum
DSLR Security forum
CastleCops Forums