Visio Services is included in SharePoint Server 2010 Enterprise Client Access License (ECAL). This post let you quickly get started with provisioning Visio Services, and to give you an idea of what things you should consider for configuration. Assuming, you already have SharePoint 2010; SharePoint 2010 includes a Farm Configuration Wizard that makes it easy to quickly provision services, assign a service account, create a web application, and create a site collection. The easiest way to start using Visio Services is to use Farm Configuration Wizard from Central Administration. When you first install SharePoint 2010, you’ll be prompted to run this wizard; You can run it again later from central administration, and it walk you through configuration.
Full Article: Visio Insights