The Microsoft Assessment and Planning (MAP) Toolkit is an agentless tool designed to simplify and streamline the IT infrastructure planning process across multiple scenarios through network-wide automated discovery and assessments. MAP performs an inventory of heterogeneous IT environments and provides you with usage information for SQL Server and servers in the Core CAL Suite, Windows 2000 Server migration assessment, SQL Server 2008 discovery and assessment for consolidation, and a readiness assessment for the most widely used Microsoft technologies including Windows 7, Office 2010, and Windows Server 2008 R2.  MAP also provides server virtualization scenarios to help you identify underutilized resources and the hardware specifications needed to successfully consolidate your servers using Microsoft Hyper-V technology.
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To learn more about MAP please take a look at the following: