'Advanced Troubleshooting Week at SQL University, Lesson 1' caught my eye today.
Not because of it's catchy title, because of the content (which i could have done with 2 years ago).
It's on SPNs (service principle names) those Active Directory entries needed for Kerberos authentication and I heartily recommend it.
Bookmarking here, so I find it again....
SSC: Troubleshooting SSPI errors - Detecting a bad SPN