The Service Catalog solution provides self-service for employees. We have deployed Service catalog based solution in several companies.
A big group of companies use this solution to manage legal consultation requests: users can request consultations from the shared service center via submitting service request in the SharePoint. Shared services managers can assign the requests to available consultants. Complex workflows are responsible for dispatching tasks. All request related data is available to the users on one page. All request related history is logged and used in the reporting. Email reminders are sent on each important request state change.