This add-in accompanies the MSDN article Publishing and Synchronizing Excel 2007 Tables to SharePoint Lists, available in the Related Links section. The add-in allows you to publish a read-write list to Windows SharePoint Services. Note that you cannot save the workbook in the new Office Open XML Formats. Instead, to retain the functionality, you need to save the workbook in the Excel 97-2003 (Biff8) file format.

Excel 2007 Add-in: Synchronizing Tables with SharePoint Lists