WSSV3FAQ

http://store.bamboosolutions.com/pfi-6-sharepoint-desktop-explorer.aspx "Browse and update SharePoint documents directly from Windows Explorer and other client-side applications using SharePoint Desktop Explorer. Simplify the process of keeping your SharePoint document libraries up-to-date. View, drag and drop, check out, edit, and check in your documents directly from Windows Explorer, Microsoft Office and other client-side applications, such as Autodesk® AutoCAD or Adobe® FrameMaker. This product is especially useful for users who work regularly in these client-side applications or prefer to manage files directly in Windows Explorer." Pricing (May 2009): USD 100 (per seat)