I picked this up off the CSLA.Net site for the $20 bucks listed. If you are trying to upgrade your knowledge from 2.0 to 3.0, you'll find it invaluable. VERY handy summation of changes and how the 3.0 Framework (WCF, WF, etc.) have been incorporated into CSLA.
As previously mentioned, I am going to get some of my game working on 2.0 (to refresh my memory...been almost a year since I worked in CSLA) and then migrate it to 3.0. This document seems to be a great tool for assisting with that.