http://office.microsoft.com/en-gb/sharepoint-server-help/using-excel-services-to-share-pieces-and-parts-of-excel-workbooks-HA102581560.aspx
https://www.nothingbutsharepoint.com/sites/eusp/Pages/How-to-Embed-a-Workbook-in-SharePoint-Using-Excel-Web-Access.aspx
Use JSOM to access data in excel workbook
http://blogs.office.com/2009/11/30/introducing-the-javascript-object-model-for-excel-services-in-sharepoint-2010/
https://www.nothingbutsharepoint.com/sites/eusp/Pages/How-to-Embed-a-Workbook-in-SharePoint-Using-Excel-Web-Access.aspx
Use JSOM to access data in excel workbook
http://blogs.office.com/2009/11/30/introducing-the-javascript-object-model-for-excel-services-in-sharepoint-2010/