Windows Vista Logo
Microsoft has just posted the requirements or guidelines in order for your application to use this logo.

Vista is fast approaching its release date. And it offers many new functionalities for programmers to be able to develop superb softwares for Vista users. So if you want to create softwares that targets Vista as its platform then you'll have to conform with the guidelines.
Download the Windows Vista Logo Requirements.
quote from the site:
"Gear Up for Windows Vista, formerly code-named "Longhorn"
By developing Windows Vista applications that adhere to the logo requirements, you can help ensure that your software products meet the expectations of your target market and are in demand by Microsoft customers. To customers, the Windows Vista partner logo means quality products that help them do familiar things more easily and new things for the very first time. Use this to your advantage by testing your software and displaying the Windows Vista logo."