In reply to nonclimber:
http://www.via-ferrata.de/klettersteige/region/deutschland
There you go - all set out by region, with photos, grades, stars, the lot. It's in German, but pretty self- explanatory.
HTH, JW
Edit - ah, I now see that you're after a human guide, not a guidebook!
JW
Post edited at 10:33