This is a list of vehicles used in a film belonging to IMCDb-members:
(feel free to add additional ones to this message)

53 olds : 1953 Oldsmobile 88
banzairunner : 1972 De Tomaso Pantera
bigbad : 1990 Citroën 2CV
bozzzydmc : 1981 De Lorean DMC 12
bubbler : 1960 BMW Isetta
CD : 1992 Audi 100 Avant quattro
chance39 : 1966 Ford Mustang and here.
cobrajim : 1975 Bricklin SV-1
convoyduel : 1977 Mack RS-712 LST
fireman : 1967 Alfa Romeo 1600 Spider Duetto
GREEN68OLDS : 1967 Oldsmobile Cutlass Supreme Four-Door Hardtop
jamesyoung : 1954 Rolls-Royce Silver Wraith James Young
lilgto67 : 1967 Pontiac GTO
Makai : 1935 Vauxhall Big Six 27hp 2-Seater Romney DHC by Martin Walter and here.
mistimathis : 1980 Excalibur Series IV Phaeton
peachy27 : 1989 Volkswagen Golf GTI II
rlebow : 1968 Ford Mustang and here.
Rogerio Matos : 1964 DKW-Vemag Belcar 1000
Russ : 1974 Dodge Monaco
sd10hl : ZiS 5
StudebakerOwner : 1951 Studebaker Commander Starlight Coupe
studie289 : 1925 Hupmobile R
studie289 : 1936 Chevrolet Master
thetopdogg : 1963 Bentley S3
Mariëlla : 1962 Bentley S2 Continental
Lester Boogie : 1973 Triumph GT6 Mk3
lobofraggin : Mercedes-Benz G-Klasse
14stutz : 1914 Stutz Bearcat

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Not sure if same or just similar:
Yellow Knight : Subaru Impreza RS

Good idea, I always wanted to make such list

Maybe it would be better to order the list by vehicle rather than by owner name?

I added few at the end of your list in the meantime.

What about cars whose owner did not post on the site, but contacted me by e-mail or posted on the forum (without registering on the site then)?
e.g.:
http://imcdb.org/vehicle.php?id=49368
http://imcdb.org/vehicle.php?id=24529
http://imcdb.org/vehicle.php?id=56115
http://imcdb.org/vehicle.php?id=73497
http://imcdb.org/vehicle.php?id=9831
http://imcdb.org/vehicle.php?id=2870
http://imcdb.org/vehicle.php?id=71800

When I worked for my father's car dealership we used to hire out/sell some cars for movies. We sold four F100's to the company making The Punisher movie http://www.imcdb.org/vehicle_102206-Ford-F-100-1977.html http://www.imcdb.org/vehicle_102210-Ford-F-100-1978.html
We also sold two F100 ambulances to the makers of Spider & Rose and hired out a third one for a background vehicle. I am trying to get a copy of this on DVD to capture pics for the Database

I just used this sorting to keep members with more than one car together.

We could add those vehicles where the owners contacted you by eMail, either using their eMail-alias or just "John Doe".

Also a list of those cars where the owner is known. This could be useful if someone (from the film industry) tries to track down a certain car (then sorting by car names or production dates would be more useful).

While it's not owned by an actual member of the IMCDb community, I did provide some background info about this restored 1988 Ford Mustang SSP. It's quite interesting if you guys want to take a look at it.

http://www.imcdb.org/vehicle_63946-Ford-Mustang-1988.html

Although it's not listed, JGSD1966 said he owns the 1966 Oldsmobile Cutlass in the background of this image: http://www.imcdb.org/vehicle_36564-Cadillac-Ambulance-1970.html

roymarks: 1932 Essex Terraplane used in The Wolf Man, 1941.

http://www.imcdb.org/vehicle_64851-Essex-Terraplane-1932.html

Tonyhavana says the BMW 2002 in this page is his personal car:

http://imcdb.org/vehicle.php?id=177110

foundafiver owned this car and drove it himself in the film: http://www.imcdb.org/vehicle_7547-Lancia-Delta-1980.html

One more, a Peugeot 106 GTI : http://www.imcdb.org/vehicle.php?id=68507 from "2serious".

Bill's 1951 Studebaker Champion:

http://www.imcdb.org/vehicle.php?id=178088
http://www.imcdb.org/vehicle.php?id=178089

cb747's 1975 Plymouth Duster: http://www.imcdb.org/vehicle.php?id=55349

duke : 1969 Triumph GT6 Mk2

BarryGibbins : 1899 Panhard & Levassor Tonneau 6HP Vincents [M2F]

This Ford Transit (converted into a tractor) was owned by a firend of mine...

Eden: Austin 1300 ADO16 http://www.imcdb.org/vehicle.php?id=123979

http://imcdb.org/vehicle_155542-Volkswagen-K70-Typ-48-1973.html

This 1966 Opel Rekord belongs to a friend of mine. More or less the only reason to see the film....

http://www.imcdb.org/vehicle.php?id=184118

A recent one-
Al_Clark- 1989 Volkswagen Golf Driver II [Typ 19E]
http://www.imcdb.org/vehicle.php?id=152422
http://www.imcdb.org/vehicle.php?id=151648

PX33's Mitsubishi:
http://www.imcdb.org/vehicle.php?id=48988

My Honda Accord
http://www.imcdb.org/vehicle_69393-Honda-Accord-1986.html

ARDEE109 owns this Range Rover ...

http://www.imcdb.org/vehicle.php?id=43870