In the past days Microsoft has released additional information around the Windows Logo program for Windows7. For most users the logo on hardware and software is an important symbol indicating compatibility and reliability on Windows.
for Windows Vista there are multiple logos indicating different levels of compatibility. For Windows7, there are two main logo initiatives. Systems, Hardware and Software. Additionally four optional additional qualifications (AQs) are being introduced. The purpose of these AQs is indicate enhanced user experience for a product. Currently these four AQs consist of Device Stage, Windows Media Center, Windows Touch and HD imaging.
So let’s assume you are buying a HP TouchSmart PC with Windows7 pre-installed. This PC would then have the Windows7 logo on it and have an additional AQ for Windows Touch and Media Center. A few months later you are buying a new mobile digital camera, this camera then has the Windows7 logo and an additional AQ for Device Stage, meaning that when you connect your camera to your PC running Windows7, the required device drivers get automatically installed through Device Stage.
Additional Resources:
About the Windows 7 Hardware Logo Program
Windows Logo Program Webcasts (I strongly recommend watching these)