This is kinda cool - a Visio connector that hooks up to the output from the Microsoft Baseline Security Analyzer (MBSA.) From the blurb:

At a glance, you'll be able to:

  • Pinpoint vulnerabilities on the color-coded diagram.
  • Identify solutions in the detailed network diagram scan results.
  • Prioritize actions based on the results presented in the network diagram

    http://www.microsoft.com/technet/security/tools/mbsavisio.mspx