- Windows SharePoint Services "v3" uses ASP.NET 2.0 technology to extend pages, sites, and server farms by building on top of ASP.NET and enabling developers to use ASP.NET features. - Key changes include Web Parts now being ASP.NET 2.0 Web Parts, improved master page functionality, forms built with ASP.NET controls, and support for ASP.NET authentication. - These changes aim to provide more consistency and make it easier for developers to build applications that can be used in both SharePoint and other ASP.NET applications.