The new Windows Vista brings many new performance and stability improvements:


- Hardware Ecosystem Support and Enhancements
- Reliability Improvements
- Performance and Power Consumption Improvements
- Security Improvements
- Support for New Technologies and Standards
- Desktop Administration and Management
- Setup and Deployment Improvements
- Interoperability Improvements
- Feature or API Changes
- General Improvements and Enhancements

The Download weights about 1.3 GBytes and was formerly released for OEM-Manufacturers - so use it of your own risk.

Link removed. As long as it is not official from Microsoft, please do not post any links to any kind of possible SP. (You will also find a complete changelog there.)