I have just integrated SSO between OpenAM and Splunk in our intranet. I must admit this is the simplest integration I have performed so far.
I took references from the following 2 links by Indira.
(Note: The instruction was not that clear though. A little tweaking is required. Minor though)
What really impressed me was the SSO debug page.
It was able to clearly indicate what SSO settings have been configured and what HTTP headers have been passed over from the OpenAM via the Policy Agent.
This makes debugging a breeze! Cool tool!