Michael Stanton just posted a more detailed session of debugging with SOS.  Michael is the development lead for our Quick Response Team, the folks who debug the nastiest kinds of crashes and errors you can imagine.  If it dies after a week in the lab, Michael can usually still figure it out.  I've always been incredibly amazed at this kind of skill.  Well worth a read, and make sure to give him suggestions on other things you'd like to see...