I've attached below a number of resources sent to me by Rainer Sonntag and Georg Eifert that might be of special use to participants in my March 2012 workshops in Germany. If you can see this it is because you haven't logged in. You have to join ACBS and then log in to see the materials.
By the way, there is a German chapter forming and there is more extensive page of German materials on the website. Just search for "German" and you will find it.