I've read that for applications that require a SharePoint 'double hop' (e.g. when using Excel Services) require Kerberos security to be configured. We're getting ready to implement a SSRS SharePoint Integrated system and want to check if the 'double hop' would be encountered in that scenario .
If you are using Windows Authentication and the data source is on another server ,then yes. If you are pointing RS reports to data sources that have the connection information in them, then no.
I agreed with Chris.For more information, please refer to: Security Overview for Reporting Services in SharePoint Integrated Mode (msdn.microsoft.com/en-us/library/bb283324.aspx)If you have any difficulties on configuration, here are two troubleshooting articles for your information:Troubleshooting Integration with SQL Server 2005 and Microsoft SharePoint Technologies (http://msdn.microsoft.com/en-us/library/bb969101(SQL.90).aspx)Reporting Services SharePoint Integration Troubleshooting (msdn.microsoft.com/en-us/library/ee384252.aspx)