The TAM tool is now available as release candidate 1. If you don't know it (already), here is the quick scoop from the download page: Microsoft Threat Analysis & Modeling tool allows non-security subject matter experts to enter already known information including business requirements and application architecture which is then used to produce a feature-rich threat model. Along with automatically identifying threats, the tool can produce valuable security artifacts such as:

• Data access control matrix
• Component access control matrix
• Subject-object matrix
• Data Flow
• Call Flow
• Trust Flow
• Attack Surface
• Focused reports

By the way, use this link to search for the video series on threat modeling in the Download Center!