iCal Server Utility
Launching it, Command-Spacebar, start type ical server utility and select it when it is the Top Hit.
Features -- http://www.apple.com/server/macosx/features/ical-server.html
Administration -- http://www.apple.com/server/macosx/docs/iCal_Server_Admin_v10.6.pdf
Reality check -- http://discussions.apple.com/thread.jspa?messageID=10403050
Catalog and Manage Organization Resources
An organization-wide resources directory is an absolute necessity for tracking and scheduling asset availability. The former Directory App for cataloging resources is now called the iCal Server Utility.