These links are hardly based on my research. I merely copied most of them from NMRC's Inofficial NT Hack FAQ. By the way, any NT Admin should be glad that such information is published.
WWW:
NT Security FAQ
Somarsoft
L0pht Heavy Industries
Cult of the Dead Cow
Net Ninja
NT Security
NT Security Net
Bugtraq
NT Research
Intrusion
ISS
Dataprotect
Nomad Mobile Research Center
Chaos Computer Club
32bit.com NT Administration
WinMag's NT page
Microsoft - Known Security Issues and Solutions
David Litchfield's Hacks on IIS
Petter Nordahl's Passwd
Hobbit's NetBIOS Paper
div. Tools bei NMRC
Passwd
Ftp:
FTP: Woodard
Service Packs & Hot Fixes
NetBIOS Auditing Tool
L0phtcrack u.a. Ftp
Newsgroups:
comp.os.ms-windows.nt.admin.security
comp.os.ms-windows.nt.admin.misc
comp.os.ms-windows.nt.admin.networking
comp.os.ms-windows.networking.misc
comp.os.ms-windows.networking.tcp-ip
comp.os.ms-windows.nt.misc
comp.os.ms-windows.nt.advocacy
microsoft.public.windowsnt.misc
microsoft.public.windowsnt.print
comp.infosystems.www.servers.misc
comp.infosystems.www.servers.ms-windows
Mailing Lists Subscription:
ntsecurity-request@iss.net
with SUBSCRIBE in the body
listserv@rc.on.ca
with SUBSCRIBE NTBUGTRAQ FIRSTNAME LASTNAME in the body