"It really is difficult to imagine a "year of PKI" because PKI isn't your typical technology trend. PKI isn't a standalone security widget, it is a complex infrastructure that must be integrated into existing applications and business processes. Once implemented however, PKI can really improve security, protect data integrity, and bolster identity management."
See also technical information on microsoft.com:
Microsoft Enterprise PKI:http://www.microsoft.com/windowsserver2003/technologies/pki/default.mspx
Microsoft Identity Lifecycle Manager (ILM):http://www.microsoft.com/windowsserver/ilm2007/default.mspx