Mikado Giessen, Karate club
mikado-giessen.de

Official AVR Site
atmel.com

Nice tutorial for the first hardware steps with AVR (german): http://www.mikrocontroller.net/articles/AVR-Tutorial

Introduction to C programming for AVR (german): http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial

AVR resources: http://www.avrfreaks.net/

F19 Ham Radio Club Wetzlar: http://www.f19.de/

F07 Ham Radio Club Giessen: http://www.darc.de/f07/

Official site: (Website currently maintained by me) http://www.laurenburg.de/laurenburg/burg/index.html