i found a very interesting site on microsoft.com about case studies, where dynamics products are used. Quite detailed information about the project, the business need, country, industry, used dynamics products, results & benefits, etc.
For more follow this.
Additional Customer Case Studies from around the world you will find at the “Microsoft Dynamics NAV Customer and Partner Evidence Materials”. This materials contain video postings, so that you will get a better impression of the project, the resolved issues and the results. For that goto here.