A new case study has been published that describes how Microsoft IT used Excel Services to build a portal for finance data. Here’s a snippet from TechNet:
Controller Workspace: Connecting With Excel Services in Microsoft Office SharePoint Server 2007
Describes how Microsoft IT created a centralized user interface platform, called Controller Workspace, that enables users to view reports, key performance indicators (KPIs), and other finance data. Out-of-box features of Microsoft Office 2007 Excel Services in Office SharePoint Server 2007 provide the foundation for the centralized portal.
The case study can be found here. There is a video demonstration at the link as well.