Just so that I do not forget about them or that they will be eliminated from the favourites linklist by accident (like is has happened so many times already):

German Speaking Sites and Forums
Vegetarisch
Vegan
Veganwelt
VeganOutReach
CrucialPoint
Vita Vegetare
Vegan Central

Shops
Demeter
Summerer
Rapunzel
Basic Bio
Prosi
Art of Soya
Dr Ritter
BioKistl
Veganversand
Soyandina

Sport/Nutrition
Sebulba
Vegan Fitness
Vegan Sport
fitness.com
Vita Vegetare
Uni Hohenheim
Talking Food
Spurenelemente
Arnold Wiegand

Recipes
Attila, der Grenzgeniale
Look Cook
Rezeptesammlung
Japanese

Authors
Stephen Walsh
Arnold Wiegand
Gill Langley

Alternative/Holistic Lifestyles
Shiatsu Austria
Vollwertleben

Meeting Places in Vienna
Art of Life
Rupps
Vegetasia

Gegenseite/Opposition
Antivegan

Others
Die Schenker
Love Is Green