Volume 13 of the Microsoft Security Intelligence Report was released this week and is available for download from the SIR website: http://www.microsoft.com/security/sir/default.aspx 

The details: "The Microsoft Security Intelligence Report (SIR) analyzes the threat landscape of exploits, vulnerabilities, and malware using data from Internet services and over 600 million computers worldwide. Threat awareness can help you protect your organization, software, and people."

And for those who are too busy to read through the report there is a great video overview located here: