"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."

http://www.news.com/8301-10784_3-9816996-7.html?part=rss&subj=news&tag=2547-1_3-0-5

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

Urs