Web articles:

http://social.technet.microsoft.com/wiki/contents/articles/3286.ad-fs-2-0-how-to-use-fiddler-web-debugger-to-analyze-a-ws-federation-passive-sign-in.aspx

http://msinnovations.wordpress.com/2011/05/24/using-fiddler-to-trace-a-saml-idp-request-from-adfs-2-0/

Web sites to decode base64 SAMLResponse:

http://decode.urih.com/data/

or

URL decoder tool: http://meyerweb.com/eric/tools/dencoder/
BASE 64 decoder tool: http://www.opinionatedgeek.com/dotnet/tools/base64decode/

Understanding SAML: http://en.wikipedia.org/wiki/Security_Assertion_Markup_Language

Cisco Webex, SSO troubleshooting: http://www.cisco.com/c/en/us/td/docs/collaboration/CWMS/1_1/b_troubleshootingGuide/b_troubleshootingGuide_chapter_01001.html