Exchange
Exchange 2000, 2003 Rule management ASP website (originally a MSDN sample -- with modifications) -- includes rulesasp.dll as well
Perl Script for Exchange (and Outlook) 5.5, 2000, 2003 Rule Creation (Helpful sor SPAM processing)

General
Perl PPM Repository
Perl Script to Manage Permissions of a ManagedBy object in Active Directory
Win32::Exchange Perl module (Exchange 5.5, 2000, 2003)

SQL
Query SQL from Perl without DBI

WMI/WBEM
Perl Script to Query WMI classes

WSUS
WSUS 2 - Reporting - perl script to send email to specified users when there are computers needing updates