Check out this web site – www.ucworld.com
The site gives great insight to the business value of UC, and how to realize the financial benefits of simply having better connected people.
There are tons of demos, videos and other resources explaining how UC can be used to save costs and increase productivity alongwith the business case and technical considerations.
UCWorld is also a peer-to-peer community dedicated to Unified Communications. You can discuss and debate on UC right off this website.