http://blogs.technet.com/ppsdocteam/archive/2009/11/05/the-new-business-intelligence-resource-center-for-sharepoint-server-2010.aspx

http://www.powerpivot.com/

With Sharepoint 2010 Business Intelligence has evolved to advanced reporting, KPI, Dashboards and more

Decatec lancia il sito della Business Intelligence - BI sulle tecnologie Microsoft

http://www.smartbi.it/

http://msdn.microsoft.com/en-us/library/cc514223.aspx

http://blogs.msdn.com/sharepoint/archive/2008/02/27/sharepoint-sdk-downloads-now-live-with-sp1-updates.aspx

A new plugin is here to restore the functionality of older Excel

http://blogs.msdn.com/scaravajal/archive/2007/06/28/excel-2007-add-in-for-syncing-with-sharepoint.aspx

https://blogs.msdn.com/ericnel/archive/2007/06/07/excel-services-in-sharepoint-server-2007-in-1-slide.aspx

(via http://blogs.msdn.com/sherder/)

Installing Excel Services

Excel Services- Supported File Format and Features

http://westcoastgrid.blogspot.com/2006/06/putting-grid-behind-excel-2007.html
http://www.decatec.it/blogs/2007/03/10/Sharepoint+2007+Log+Parsing+With+Excel.aspx
http://msdn2.microsoft.com/en-us/office/bb203828.aspx
http://www.gridbus.org/excelgrid/
http://weblog.infoworld.com/openresource/archives/2005/11/taking_excel_to.html

http://blogs.msdn.com/sherder/archive/2007/03/13/excel-services-welcome-to-the-future-of-spreadsheets.aspx

http://blogs.msdn.com/echarran/archive/2007/03/09/use-excel-2007-to-read-and-parse-sharepoint-2007-logs.aspx

http://blogs.msdn.com/brittog/archive/2007/02/16/wht-you-get-with-office-2007.aspx

Sharepoint 2007 User Defined Functions (UDF) : Share your Excel formulas in Sharepoint 2007 Excel Services