Integrated with the newly re-architected IIS 7.0, ASP.NET, and the Microsoft .NET Framework Designed as a single-purpose Internet-facing Web server, Windows Web Server 2008 delivers on a rock solid foundation of Web infrastructure capabilities in the next-generation Windows Server 2008, enabling any organization to rapidly deploy Web pages, Web sites, Web applications, and Web services.

http://store.microsoft.com/microsoft/Windows-Web-Server-2008/product/508FCC29

Microsoft SQL Server 2008 Workgroup is a reliable data management and reporting platform that delivers secure, remote synchronization and management capabilities for running branch applications. It includes the core database features of the SQL Server product line and is easy to upgrade to Standard or Enterprise.

http://store.microsoft.com/microsoft/SQL-Server-2008-Workgroup-Edition-5-Client/product/D261DC5E

you can use Google Analytics to track your site traffic, this matches with GA to capture visitor source without any configuration. When visitor registers or places order, the source will be automatically recorded. You can then run report tool to show metrics.