Jetstress for Exchange 2010, Exchange 2007 and Exchange 2003 have been written about for a while, however, we haven't had the official word on planning, installing and configuring Jetstress, as well as once it's run how to accurately read and interpret Jetstress reporting data.
Introduction to Jetstress
Planning for Jetstress
Jetstress Output Files
Reading Jetstress report data
and a number of appendices with more detail on configuration and command line options.