Perhaps I think I know what it might be: a 1952 Fiat 500 C.
I've recognized it by the front.
But, as I told you, I'm not sure if it's true yet.

By the way, in the scene when Bond walks through Siena after the fight on the scaffolds, an Alfa 156 passes on the street. Now, look in the lower left corner: there's a strange vehicle, I don't know what it might be. If you know what is it, can you tell me?

I do not find the Nissan well visible, but it is not very common at least

The Iveco even has a small role, as the Aston is about to crash into it.

Well, I've seen the scene and some of the cars are not very visible (Fusion, Galaxy), but the Iveco and Nissan truck, and also the 206, are well visible, so I think they can be listed. Thank you very much!

Well from the description we can't say if they are worth listing
That can be done only from the pictures.
But there does not seem to be rare models, so they have to be well visible/noticeable to be listed.

Here are all the veichles that I've seen:
1)Ford Fusion, when the Aston Martin begins to run;
2)Grey van in front of the VW (I say it's a 2006 Ford Galaxy);
3)White lorry in front of the Aston Martin (I had to look over it for a long time, and now I'm sure it's a 2006 Iveco Daily);
4)Nissan Atleon behind the Alfa;
5)Peugeot 206 in front of a grey hatchback (maybe a 1990's Fiat Punto?).
That'all. I'll wait for your answers.
Bye!

There are for sure more vehicle visible than what is on the site, but it is possible that most of those weren't considered worth listing if they were too briefly seen and/or too blurry

Can you tell us which cars you saw and in what moment of the scene? I will post them if you tell me where they are.

Hi! I've seen Quantum of Solace's first scene with Aston Martin and Alfa Romeos. I've noticed a few veichles in the background... 30/08/2014 @ 16:46:33