Not comprehensive, but pretty good for a German based site! And the Sandy Denny stuff is very good. At one time Reinhard's site was really the only good Denny resource on the Web - and then it disappeared (don't know if there were copyright issues as so often with anything associated with Sandy). Anyway, well done Mr. Zierke, it's back.

A scholarly article about Sandy's songs is here
http://www.pemward.co.uk/