For those of you who have access to one of the interim builds of SharePoint 2010, specifically 4730.1010, you will very likely find claims to be pretty much non-functional.  Like after everything is set up and you hit the SharePoint site, you are taken to the page that says "you are signed in as Joe Blow and you are denied access.  You can sign in as another user or request access".  I'm not the ultimate end-all source on this, but it appears that this is just broken in that build.  Since I know a lot of you TAP and RDP customers may be getting that build, I am hoping that this will save you some time and frustration.