If you liked the Windows Vista Hardware Assessment, you will love the free Microsoft Assessment and Planning Solution Accelerator. Free, agent-less deskotp and server assessment, including hardware and device inventory, compatibility analysis, and readiness pre-fab reports that'll make you look like the genius you are to upper management. Salty goodness.
This release also includes new features for gathering performance metrics from computers you are considering for consolidation using Microsoft Virtual Server 2005 R2. Using the performance metrics and a model virtual server host computer, you can generate reports that recommend placement of the physical servers in a virtual server environment. This tool incorporates the assessment features provided by the Windows Vista Hardware Assessment Solution Accelerator, including localization of the Windows Vista assessment reports in French, German, Japanese, Korean, Spanish, and Brazilian Portuguese.
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TechNet Edge has a couple of good videos:
Solution Accelerators Beta release PM interview - Part 1
Solution Accelerators Beta release PM interview - Part 2