From Patrick Tisseghem's blog, some links about Excel Services in Sharepoint 2007.
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In addition to the material covered, here are some useful links to resources if you want to learn more on Excel Services:
Walkthroughs of working with the Web Service, the User-Defined Functions (UDF) extensibility, …
- http://blogs.msdn.com/excel/ had a series on Excel Services
- Introduction to Excel Services, or “running Excel spreadsheets on a server”
- Excel Services – Key Scenarios
- Excel Services – Architecture
- How do I publish workbooks to the server?
- Excel services part 5: all about “interactivity”
- Excel Services part 6: Building applications with Excel Web Services
- Excel Services part 7: Sample application with Excel Web Services
- Excel Services part 8: Controlling and protecting spreadsheets
- Excel Services part 9: Controlling and protecting spreadsheets continued …
- Excel Services part 10: Data Connection Libraries, or connecting to databases made easy, manageable, and secure
- Excel Services part 11: Excel Server, SharePoint, and dashboards
- Excel Services part 12: Unsupported features