I have published "Looking at Processes, Modules, and Threads with Powershell 2.0 Part I". The paper concerns itself with comparing Processes, Modules, and Threads and offers some discussion for comparing their changes over time. See also:
http://www.rmfdevelopment.com/PowerShell_Scripts/diff_PMT.ps1
http://rmfdevelopment.com/PowerShell_Scripts/diff_PMT_adv.ps1
