What are the cost savings (or %)per process a large IT ($200M) shop
can expect by implementing II Service Management (ITIL ITSM). Please list as:

Service Desk - X%
Incident Management - X%
Problem Management - X%
Change Management - X%
Configuration Management - X%
Release Management - X%
Availability Management - X%
IT Continuity Management -X%
IT Cost Management - X%
Service Level Management - X%
Capacity Management

You could try asking this at the ITIL Support Group
(http://www.15000.net) or one of the other major forums dedicated to
ITIL. There will be no single answer, but if you can get a number of
responses the average will give you a guide (looking at the above date
though you have probably moced on by now).