Windows Live Safety Center Beta
Get full service for your PC
Windows Live Safety Center is a new, free service designed to help ensure the health of your PC.
* Check for and remove viruses
* Learn about threats
* Improve your PC's performance
* Get rid of junk on your hard disk
Use the full service scan to check everything, or turn to the scanners and information in the service centers to meet your specific needs.
More info at Welcome to Windows Live Idea
They also created a new blog staffed by Microsoft's Anti-Malware Team.