Utilities:
General
Ten Thumbs Typing Tutor
WinBatch Automate Windows.
File
TreeSize Folder size.
Winzip Archiving and compression.
Irfan Graphics file viewer.
Security and auditing
Stealth Keyboard Interceptor
Redbutton View another network's registry if they haven't disabled the "Everyone" group.
NT Spectre Security checker.
Editor
Emacs Powerful Editor for Unix or NT.
UltraEdit Great all-purpose editor.
System
DumpACL View groups and permissions.
NT Resource Kit updated utilities
Server Tools for Workstation
ShutDown Plus Run programs at shutdown instead of logon.
Perl Scripts from Essential Windows NT System Administration includes amu.pl: script for adding multiple users.

Remote Computing:
VNC Access your desktop remotely, even reboot - including from a Mac or Unix box.

Utility Collections:
Microsoft's NT Server Tools Page
Utilities from System Internals Do not take a job as a sysadmin without checking out this site thoroughly!!

NT Security Sites:
NT Security Site
NT Security FAQ
NT Security Info
NT Security Checklist

NT Resource Pages, most include software libraries:
Microsoft's NT Workstation Site Read this first.
Microsoft's NT Server Site And this.
NTFaq Excellent explanations of NT topics.
JSI's NT Tips and Hacks Collection Great collection of tips in Q & A form.
Windows NT Information Center (BHS) Includes help/discussion board.
Windows NT Resources (Scott Ladewig)
Windows NT Resource Site (Chancellor and Chancellor)
Windows NT Resource Center (Jim Buyens)
Monster Board's NT Page Listings

Periodicals:
MCP Magazine
WinNT Magazine

Software Libraries:
DaveCentral
PC Computing
TUCOWS

Learning Tools:
ClassChat (Don't download this yet, I'm still working on it)
JLab

Games:
KChess (16 bit Windows app you can use to practice with WOW)

Perl:
software (free)
ActiveWare Perl Page
info
www.perl.com
books
Learning Perl on Win32 Systems. Schwartz, Olson & Christiansen (O'Reilly) $29.95
Effective Perl Programming. Hall, Schwartz. (Addison Wesley) $32.95
Perl Resource Kit - Win32 Edition. 4 books and CD, 1,832 pages (O'Reilly) $149.95

Totally Unrelated But Very Kewl:
IPIX Sample - more info and samples at IPIX
MP3