There's a nice guidance automation hands-on-lab available from teched, created by Daniel Cszzulino. Unfortunlately, if you tried to compile the source from the download on a VS 2005 Beta 2 or later without VSIP installed(which you don't really need), you're going to run into some problems. It's a good thing that Daniel posted a note about how to get over these hurdles and make the thing compile. It's actually a very cool sample of generating a data layer tier for an application using the GAT extensions.