Links to some of the best unofficial fan sites:

Voices in the net (the most detailed and comprehensive TD discography on the net): https//www.voices-in-the-net.de

The Zest (the unofficial Tangerine Dream group on Facebook): https://www.facebook.com/groups/TheZest

TADREAM (the Tangerine Dream Mailing List Homepage): http://tadream.net

Klaus Beschorner: http://www.caby.de

Rainer Rutka: http://www.rutka.de/td

Heiko Neumann: http://www.opticaldream.de

Al Benson: http://marspolaris.tripod.com/index.html

Biography (in French):

http://pagesperso-orange.fr/frederic.gerchambeau/melotexte8.htm

Discography (in French):

http://pagesperso-orange.fr/kvdl/P1.htm

Wikipedia Tangerine Tree listing:

http://en.wikipedia.org/wiki/Tangerine_Tree