Some cool cars images:
Nash car dealership

Image by The Library of Virginia
Title: Nash car dealership
Creator: Adolph B. Rice Studio
Date: March 20, 1954
Identifier: Rice Collection 294F
Format: 1 negative, safety film, 4 x 5 in.
Rights Info: No known restrictions on publication.
Repository: Library of Virginia, Prints and Photographs, 800 E. Broad St., Richmond, VA, 23219, USA, digitool1.lva.lib.va.us:8881/R
[Bob Burman, race car driver] (LOC)

Image by The Library of Congress
Bain News Service,, publisher.
[Bob Burman, race car driver]
[between ca. 1910 and ca. 1915]
1 negative : glass ; 5 x 7 in. or smaller.
Notes:
Current title devised by Library staff based on information provided by the source: Flickr Commons Project, 2008.
Title on negative: "Burman."
Forms part of: George Grantham Bain Collection (Library of Congress).
Subjects:
Automobile racing
Format: Glass negatives.
Rights Info: No known restrictions on publication.
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
General information about the Bain Collection is available at hdl.loc.gov/loc.pnp/pp.ggbain
Persistent URL: hdl.loc.gov/loc.pnp/ggbain.09237
Call Number: LC-B2- 2202-4
Decorated Saab car as sculpture (back-er)

Image by Chris Devers
Fittingly, the license plate said "MEOW".
See this picture for a little more of the hood.
I’m not sure which Saab model it is: maybe a 90s vintage 900 or 9000, or maybe a 2000-ish 9-3 (first generation) or 9-5.
In any case, the real answer is that this car is truly one of a kind now.
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Bostonist.com: Bite Size News, July 29, 2008
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UPDATE 12 Jan 2010: Spotted again! I saw the car while driving through Harvard Square this morning, and was able to stop & get a few more photos of this magnificent, magnificent beast of a car — and with the better camera, too. Enjoy!
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UPDATE 30 Mar 2010: The hunt is on! Teresa Hanafin at Boston.com’s RAW Blog today ran Who drives this funny car?, in which a Globe reader from Andover is asking for info about the owner of the car, noting that it has been several times in Boston’s northwest suburbs (Burlington, Arlington, Andover, Cambridge, etc). According to some commenters, the owner may live (or work?) in Belmont, as it seems like it’s seen there pretty often.
I don’t want to infringe on the driver’s privacy too much, unless she wants to "out" herself as the owner of this fine machine, so I’ll simply add the handful of clues that I have:
• Both times I’ve seen the car, a woman was driving it.
• When I saw it in Harvard Square in January, she was wearing a Dr Seuss hat.
• When I saw it near the Museum of Science in July 2008, there was a couple of kids in the back seat, one with curly (red?) hair.
• She’s way ahead of you on the "EYESORE" jokes
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UPDATE 31 Mar 2010: The Boston.com blog post ferreted out the info within hours:
Jenny wrote to let us know that a correspondent for one of the Globe’s regional editions wrote about the car, identifying the owner, about a year and a half ago.