We understand web services and know how to build them. We'll do the work, and you can REST :-)
Leave the protocols, database and enterprise application integration, custom application enhancements, documentation, discoverability, performance, security, authentication, authorization, and scalability issues up to us.
Contact us to hear about a Virtual Collaboration Platform we helped design for Argonne National Laboratory on top of SharePoint 2010, consisting of a custom service application, and deeply integrated into almost every aspect of a SharePoint farm. This custom platform simplifies user registration and management, flattens an otherwise complex hierarchical site structure into project-based initiatives complete with custom administration screens, and a custom application SDK.