Jason Zander put together a reference application “Image Viewer” that shows how to enable some cool Windows 7 features in your XP or Vista applications with relatively little effort and without sacrificing backward compatibility. You can download the application and source code here.

• Multitouch
• Application Recovery
• Windows Search
• UAC
• Scheduled Task
• Windows 7 Taskbar Integration
• Transactional File System
• IO Optimization
• Event Tracing for Windows (ETW)
• Microsoft Management Console
• Windows 7 Libraries
• Windows 7 Sensor and Location Platform
• PowerShell
• Preview Handler
• Aero Glass
• Trigger Start Services