What direction should I research for SSO?

[funkyFlash]

Greetings, folks. I may get flak for "JFGI", but it seems the more I research, the more confused I get.

I'm looking for a SSO solution at my house. Why? Why not. I have several gentoo systems, a Windows machine, and a Mac. I feel like there should be a way to unify authentication between the three, without using Active Directory. I was under the impression that LDAP and Kerberos is the key to happiness for what I seek, but I don't know how to make them play nice together.

I've read http://forums.gentoo.org/viewtopic-t-565180-start-0.html, and have set up a Kerberos infrastructure on one of my Gentoo systems. I have two systems happily authing with passwords I set in kerberos (with some difficulty, but that's beyond the scope of my question). However, the article states that I still have to create the accounts by hand on the systems. So, my question is this: can I take care of that with LDAP, but still maintain the functionality of having windows use my Gentoo kerberos to auth? And how?!

I appreciate any insight, and especially guides that you have found useful.
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