I spent today trying to get the Customer Self Service portal configured on my demo AX2012 system, and after a few false starts, the corruption of a user account, and a little help from a collegue, I was able to get it all up and running.
So that others don't make the same errors that I made, I thought that I would post the complete walkthrough on how to configure remote users, and the customer self service catalogs here: http://www.slideshare.net/murrayfife/configuring-customer-self-service-portals-in-dynamics-ax-2012
Once it's up and running it's pretty cool.