Microsoft released Windows Defender Beta 2
Windows Defender Beta 2 Build 1051 available for download
Download from Microsoft

Features
- Windows Defender is part of Windows Vista
- Support for non-admins to runs scans and remove detected threats
- The 'heavy lifting' of Windows Defender is done by a system service
- Streamlined, easier to use UI, with a completely redesigned UI for RTP
- Enhanced Software Explorer views - especially the classification column and network connected programs view
- The ability to update our engine and definitions via WU
- Sample submissions and improve data telemetry to improve future definition updates
- Better signatures that allow WD to detect and remove items that WAS B1 cannot
- Accessibility support (one of our biggest complaint areas in WAS B1)
- Localized Japanese and German builds on the way soon
- Native X64 support
For more information on Windows Defender (Beta 2) please visit the new website at http://www.microsoft.com/antispyware
via Calendar of Updates