Fabian Müller, Premier Field Engineer (PFE) in Germany, just wrote a detailed article discussing a commonly asked question: how do I determine if a smart card was used for logon? The article is posted on the TechNet Wiki with a link to the Script Center for your convenience. Check out the article at: http://social.technet.microsoft.com/wiki/contents/articles/11844.find-out-if-a-smart-card-was-used-for-logon.aspx