Windows Client Feature Comparison
Microsoft has compiled and published a Windows client feature comparison chart that compares various features of Windows XP Service Pack 3, Windows Vista Service Pack 1 and Windows 7. The comparison chart has been designed for IT Professionals and is divided into the five categories File Organization and Search, Remote Access, Security & Compliance, Management and Deployment.
The chart can be downloaded as a single page pdf document from Microsoft.
It has already received some mild criticism as it looks like an attempt to put Windows 7 in a good light in comparison with the other operating systems. It is for example obvious that a feature introduced in Windows 7 is not available in the other two operating systems.