Single Sign On solution

I didn't know where to post this one exactly, so if there is a place where the question can get better viewing and help please let me know and I'll ask a mod to move me or something.

I'm looking to conglomerate several web applications and servers with one login, and I've been making some headway but havce run into some stumbling blocks as well.

In particular I was looking at Yale's CAS or central authentication service. Is there anybody who has worked with this before, or with some sort of single sign on type project that can throw me some much needed knowledge.

So far what I'm looking at it the aforementioned CAS authentication server and OpenLDAP on a tomcat 5.0 server.
Currently the system is going to run intranet, but it has the possibility of branching out an being an internet application. I would like to look as far ahead as possible.

On the off chance that someone can help out with the problem at hand, let me lay out where I am currently at. I'm following this tutorial on setting up the items I mentioned above. I created the certificate, changed the tomcat server.xml and popped the page. Everything works. Next I build the server and client java archives and plug them into tomcat. I attempt to pop a page from the cas directory and login (this without it actually taking me back to another applications work page. After putting in the same user and pass I get a "login success" so that's working.
Then I change the web.xml file for the hello world example (per "Getting started with CAS"). I go to the page and I get the login screen. But this time no matter what I enter in (user and pass still being the same) it denies my request and kicks me out. I don't know what I'm missing there and why i can't get to the login screen.
I did try restarting the server and closing and reopening the browser several time to lose the cert acceptance, but to the same effect.
if I can get past that roadblock I might be able to lay out the rest of this pretty easily, who knows.

thanks again for any help you can provide.
[ October 04, 2005: Message edited by: Gran Roguismo ]