From Ardfry Imaging:
View PSD files in Windows Photo Gallery and Windows Live Photo Gallery. You can view PSD files in Media Center on Windows 7. Now you can also view your Adobe PhotoDeluxe PDD files. View PSD and PDD files throughout Windows, including PSD files exported from other third party applications such as Lightwave3D and Modo. View XMP, IPTC, and EXIF metadata from PSD files. Search the file system based on metadata using Windows Desktop Search.