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Adam Saxton posted his great Kerberos troubleshooting guide, which covers both Reporting Services in native mode as well as SharePoint integrated mode configurations:
https://blogs.msdn.com/b/psssql/archive/2010/06/23/my-kerberos-checklist.aspx
If you are specifically troubleshooting Kerberos with a Reporting Services 2008 deployment, you may also want to check out the following whitepaper:
https://msdn.microsoft.com/en-us/library/ff679930.aspx
Update (July 18):
A new whitepaper for Configuring Kerberos Authentication for SharePoint 2010 products has just been released. Section 4 of that whitepaper explains identity delegation for Reporting Services.