MZ Factory official website: http://www.muz.de/

Importer and spares supplier in the UK: http://www.grahamsmotorcycles.com/index.htm
They are able to supply spares for Yamaha, 125 and 1000cc engined MZ models, and have the parts book for the Skorpion on their website: http://www.grahamsmotorcycles.com/2010%20WEB%20SITE/Skorpion_Menu.htm They take PayPal, and accept orders from anywhere in the world. 

Clubs, groups, etc

MZ Riders Club. (Almost exclusively 2 stroke these days). http://www.mzridersclub.com/

MZRC South of Scotland Section website http://mz-thistledown.com/index.htm

Thumper Club (UK based club for single cylinder motorcycles). http://www.thumperclub.com/index.php

German MZ Skorpion site (in German).
MZ Skorpion 660 Club Finland (in Finnish). http://www.sunpoint.net/~mzskorpionclub/

MZ Riders.com (US based MZ e-community). http://www.mzriders.com/

mz_riders group at Yahoo. (UK based, mostly 2 stroke). http://groups.yahoo.com/group/mz_riders/

MZOG group at Yahoo. (US based, mostly 4 stroke). http://autos.groups.yahoo.com/group/MZOG/

MZ Website (in French):http://mzmuz.free.fr/chrono-site_mz/index.php

Grampian Classic Motorcycle Club http://www.gcmcc.co.uk/

A couple of guys racing Skorpions http://homepage.ntlworld.com/smiggs/index.htm

Monoconnection. (A Dutch language site for single cylinder motorcycles). Lots of modified Skorpions and plenty of pictures. http://www.monoconnection.nl/

German based Skorpion racing championship (in German) http://www.mzcup.de/

German MZ Club (in German): http://www.mz-club-deutschland.de/

Parts specialists, etc

VD-Classic (France) Custom Café Racers, including Skorpion

VD-Classic : Yamaha 500 SR, 500 XT, Kawasaki 650 W, Buell, Harley davidson, Triumph