Jerry Bryant [MS] has an excellent post with links to Security resources that are provided by Microsoft. I am copying this here so that I do not have to go looking for them later:

Tools

• Microsoft Baseline Security Analyzer (MBSA)
  Use this tool to identify common security misconfigurations and missing security updates. MBSA runs on the Windows Server™ 2003, Windows® 2000, and Windows XP operating systems and will scan for vulnerabilities in multiple products and technologies, including Microsoft Internet Information Services (IIS) and SQL Server™.
• Software Update Services (SUS) / Windows Update Services (WUS)
  Quickly and reliably deploy the latest security updates, and service packs with Software Update Services. This new site now has the latest info on WUS.
• Windows Update
  Scans your computer and provides a selection of updates tailored for your operating system, software, and hardware.
• Microsoft Office Product Updates
  Scans and updates Microsoft Office products.
• IIS Web Server Lockdown Wizard
  Reduces the attack surface of Internet Information Services (IIS) and includes URLScan to provide multiple layers of protection against attackers.
• UrlScan Security Tool
  Helps prevent potentially harmful HTTP requests from reaching IIS Web servers.

• Mydoom, Zindos and Doomjuice worms
• Blaster Removal Tool for Windows XP and 2000
• Sasser (A-F) Worm Removal Tool
• MS04-028 Enterprise Scanning Tool    

• http://www.microsoft.com/technet/security/tools/default.mspx
• Security Risk Self-Assessment for Midsize Organizations

• Understanding Update Management: Microsoft’s Software Update Strategy
  Updated white paper talks about the need for strong update management process.
• Other Update Management info in the TechNet Topics Page

• Listing of resources for the IT Pro to evaluate and deploy XP SP2
• Network Access Protection
• Internet Security and Acceleration (ISA) Server 2004 whitepapers updated
  Read about secure remote Outlook access in the Unique Protection for Microsoft Exchange Server whitepaper, a very viable business scenario with ISA Server

• Trustworthy Computing: Security
• Whitepapers on Security Enhancements:
  Describes the Trustworthy Computing initiative as applied to the Windows Server, Office 2003 and Exchange Server 2003 development processes respectively.
  Windows Server 2003
  Office 2003
  Exchange Server 2003
• Get the Facts:
  Windows and Linux
• SQL

• Security Guidance Centers on Microsoft.com
  Worldwide
  US
  Prescriptive guidance to help provide defence-in-depth security.
• E-Learning Security Training
  E-Learning self-paced clinics - 4 Developer and 8 ITPro modules
  Now available in French, German, Spanish and Japanese
  XP SP2
• Security Guidance Kit CD (now shipping in US and Canada)
  CD-ROM with tools, templates, and how-to guides
• Microsoft IT Security Showcase
  An insider view into Microsoft's process of deploying, and managing its own enterprise solutions.
• Security Newsletter
  Register for our free monthly e-mail newsletter that's packed with security news, guidance, updates, and community resources to help you protect your network.
• Security Program Guide: Events and Training Information
  Events, webcasts and training ivailable for both IT Professionals and Developers.
• US Security Summit Keynote and Training Content
• Security Notifications via e-mail
  Sign up today to get e-mail alerts when an important security bulletin or virus alert has been released.
• Security Update RSS Feed
• Security Bulletin Search Page
  Search on product, technology or KB article
• Security Bulletin Webcast
  Join Microsoft experts on the day after bulletin announcements to get the latest information and have the opportunity to ask questions.
• How to Tell If a Microsoft Security-Related Message Is Genuine
• Writing Secure Code, 2nd edition
  Best practices for writing secure code and stopping malicious hackers.
• Building and Configuring More Secure Web Sites
  Best Practices used at OpenHack.
• Recent Security Guidance Center additions:
  Windows XP Guide, includes SP2
  New Security Risk Management Guide
  Windows NT 4.0 and Windows 98 Threat Mitigation Guide
  Microsoft Identity and Access Management Series
  Antivirus Defense-in-Depth
  Securing Wireless LANs with PEAP and Passwords
• Small Business Guidance
  Guidance specifically for the smaller business
• Configuring Windows XP 802.11 Wireless Networks for the Home / Small Business
• Consumer Information:
  http://www.microsoft.com/security/protect
  http://www.microsoft.com/athome/security/default.mspx
• Newsletter for home users
• Security bulletin notifications for home users