Set of TechNet articles on AD Federation Services
Adam Conkle has published some great troubleshooting, tips and tricks and how to articles on TechNet that should help you in evaluating and implementing Active Directory Federation Services.
AD FS - How to invoke a WS-Federation sign-out
AD FS 2.0 - Prompted for credentials when you are expecting to be allowed anonymous access
AD FS 2.0 - How to set the Primary Federation Server in a WID Farm
AD FS 2.0 - The Admin event log shows Error 111 with System.ArgumentException: ID4216
AD FS 2.0 - Browsing to Federation Metadata fails "Unable to download federationmetadata.xml"
AD FS 2.0 - Continuously prompted for credentials when using FireFox 3.6.3
AD FS 2.0 - How to configure the SPN (servicePrincipalName) for the service account
AD FS 2.0 - Continuously prompted for credentials while using Fiddler Web Debugger
AD FS 2.0 - "Script is disabled. Click Submit to continue."
AD FS 2.0 - How to enable and immediately use AutoCertificateRollover
AD FS 2.0 - How to perform an unattended installation of an AD FS 2.0 STS or Proxy
AD FS 2.0 - The AD FS 2.0 Windows Service fails to start - Event 102 and 220 logged
AD FS 2.0 - How to manually run the AD FS 2.0 Initial Configuration
//Brjann Brekkan