Just got a note saying that Jim Allchin posted an Open Letter to developers on MSDN to encourage them to build, port, test and run their applications on Vista. here's a short blurb:
Why should developers target the Windows Vista? Windows Vista provides a range of new features that will benefit developers, businesses and end users alike. It will make it safer and easier to accomplish everyday tasks, help you find information more easily, and provide the best user experiences and scenarios through the following new features:
For information on many other new features in Windows Vista, including Sidebar, Games Explorer, Photo Gallery, Media Center, and Windows Media Player 11, check www.microsoft.com/windowsvista.