If you need to Inventory SQL, and some other servers from MS, please check out the MAP tool http://technet.microsoft.com/en-us/library/bb977556.aspx
The Microsoft® Assessment and Planning Toolkit (MAP) makes it easy for you to assess your current IT infrastructure and determine the right Microsoft technologies for your IT needs.
MAP is a powerful inventory, assessment, and reporting tool that can securely run in small or large IT environments without requiring the installation of agent software on any computers or devices. The data and analysis provided by this Solution Accelerator can significantly simplify the planning process for migrating to Windows Vista®, Microsoft Office 2007, Windows Server® 2008, Windows Server 2008 Hyper-V, Virtual Server 2005 R2, SQL Server 2008 and Microsoft Application Virtualization (formerly SoftGrid).
MAP expands upon the assessment features included in the Windows Vista Hardware Assessment Solution Accelerator. These features include Windows Vista assessment, Microsoft Office 2007 assessment, and non-Windows device inventory, using the Simple Network Management Protocol (SNMP). Reports for these assessment scenarios are localized in French, German, Japanese, Korean, Brazilian Portuguese, and Spanish.