(Prereq: PSPKI - http://pspki.codeplex.com)
Get-Smartcard -CommonName "Commonname, User"
Get-Smartcard -CommonName "*user*"
Revoke-Smartcard -SerialNumber 190000001562ffb398518e9aa2000100000015 -Reason Superseded
(Reasons: Unspecified - (default),KeyCompromise,CACompromise,AffiliationChanged,Superseded,CeaseOfOperation,Hold, Unrevoke)
Get-Smartcard -CommonName "Commonname, User" | Revoke-Smartcard -Reason CeaseOfOperation