It's basically the same process, XBM is a bit different and you use xRead and xFlash commands instead of SAMREAD and SAMHACK. Textbook is working on an update to his tutorial, for now you can find several at x-projects.org. One in particular should look very familiar.
As long as you don't have Vista you could also download 0.3.6 in the Downloads section and follow along with Textbook's tutorial.