Some useful links:
http://www.productioncars.com/dx5/press_photos2.php?make2=Volvo (Volvo pictures)
http://www.k-jet.org/ (information on, mainly, U.S. Volvo's)

http://wiki.mercedes-benz-classic.com/index.php/Hauptseite (Mercedes data)
http://www.sl113.org/wiki/DataCard/PaintCodes (W113 colour codes)

http://www.oldtimer.400.pl/Wlochy.html (Italian body makers)

http://www.zuckerfabrik24.de/index.html (Fiat)

http://www.twthieme.nl/index.html (Alfa Romeo)

http://www.trucksplanet.com/catalog/ (HGV's all over the world)

http://www.philseed.com/simvedette.html (Simca and others)

http://www.lov2xlr8.no/broch2.html (miscellaneous)