Microsoft has created a security portal on their website with some excellent resources on the latest online threats.  It is called the Microsoft Malware Protection Center and the initial release contains:

• Four “Top 10″ lists:
  • Desktop Threats
  • MSRT (Malicious Software Removal Tool) Detections
  • Most Active Email Threats
  • Adware/Spyware
• An encyclopedia of malware and unwanted software
• Links to more tools & resources
• Sample submission page:  A place to send the team files, suspected to contain malware, to be analyzed
• Definition updates for Windows Defender as well as Forefront Client Security

I originally found out about the new portal from the Spyware Sucks blog.  They kept referring to it as the MLPC (which probably goes back to the Live branding confusion saga).
NOTE:  They changed MLPC to MMPC after I wrote this blog post.

There is also some good information on the Anti-Malware Engineering Team blog about version 1 of the portal going live.  They mentioned that this release was just a beginning and asked for people to send feedback about the portal to mpcfb@microsoft.com.