Hitting Code Complete. A tester -- sitting in their office -- can configure the operating system and hardware they want to use (for example: Windows Server 2000, Advanced Server Edition on a 2 processor hardware configuration with a German language build) as well as the test suite they want to run (for example: all session state tests).  The automation framework with then find a hardware machine that meets the specification selected, reformat and re-image the operating system for the choice selected, and then execute the test suite run.  All pass/fail results can then be viewed by the tester on their own machine with their office (fairly fancy -- we are quire proud of this testing framework). [ScottGu's Blog]

Wow!