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There’s a neat feature built into Windows 7 and the Windows 2008 Server R2 variants in powercfg. It performs a fairly simple power audit and will tell you if there are improvements, what your hardware can support, and what device or software is preventing your machine from entering sleep. You simply run “powercfg –energy” from a command line and an html report is created in “c:\users\%username%”  called “energy-report.html”.

Here’s an example report from one of my systems.