Excellent Article regarding ADFS Setup over ACS and WIF
http://blogs.msdn.com/b/willpe/archive/2010/10/25/windows-authentication-adfs-and-the-access-control-service.aspx

It explains various example sites and implementing ADFS Authentication via code

http://stackoverflow.com/questions/8600636/integrate-wcf-with-adfs-2-0-and-acs-some-guide-needed

Nice Article about ADFS 2.0 - Explanation about the how it helping for Cloud based Application Authentication.
I am doing research on this ... So i love it..
http://redmondmag.com/Articles/2010/06/01/ADFS-2-Opens-Doors-to-the-Cloud.aspx?Page=1

Happy Holidays guys