To expand on my last comment, yes there are fan sites listing the vehicles but the problems with these are: 1) They only have lists of vehicles if the game is a gigantic world-wide success like the Grand Theft Auto trilogy, 2)they usually have poor or no pictures, 3)If the car is a fictitious, real-car based car like the cars from GTA or FlatOut, they don't list the real name of the car, 4) They don't have a forum where you can post comments and 5) The sites usually don't list all the cars and the websites that do are very few.
I don't see the big deal because it isn't really any different then animated movies/tv series. All you have to do is add another catagory like "video game" and then it is just like adding movies. And, it is even easier then movies because you can find most images on the net. I think it is an awsome idea, and it won't be out of place because it is basically an animated movie/TV series only it is interactive and you control it.