In reply to bug spencer:
Hi
I spent 2 weeks in the area last summer doing ferratas and climbing.
This book is very good:
http://www.alpinverlag.at/buecher/klettersteigfuehrer_oesterr.html
It has good diagrams and maps and each route has an English write up as well as a German one.
You can buy this in a book shop in the old town, they also sell 2 or 3 other via ferrata books to the local area.
PM me and I will see if I can send you some more info.
Sam