Images to go with entries:
Tony Soprano's 1999 Chevy Suburban, driven in series 1-4
It was upgraded with billbars in series 2 this is a picture of it from series 1
Paulie Walnuts' Cadillac Seville, driven in series 1-2
Christopher Moltisanti's 2000 Mercedes CLK, driven in series 2-3
Johnny Sack's 2004 Maserati GT, driven in series 5 (possibly in series 6 but I haven't seen any of it yet since I live in England)
Johnny Sack's Mercedes S500, driven in series 4-5
This is not an episode still but a production photo from the HBO website
Phil Leotardo's Lincoln Towncar, driven in series 5. It had a funny spare wheel cover mounted onto the rear and got into a crash, and there was some considerable haggling over the repairs thus it played a significant part in a couple of series 5 episodes. This is not an episode still but a production photo from the HBO website
Tony Soprano's 2004 Cadillac Escalade ESV, driven in series 5 (possibly 6 as well). He did have a black model before this one but it was written off in a crash in episode 5.5 "Irregular Around the Margins" and drove this white model from episode 5.6 onwards
Livia Soprano's 1963 Oldsmobile 88, featured in series 1-2 driven by her and Janice. The rear of the car appears on the right of this still. If I find a better still I'll post it.
Christopher Moltisanti's 1999 Lexus LS400, driven in series 1
A 2001 Mercedes SL (possibly an SL600) which Tony took for a test drive with Gloria Trillo in episode 3.8 "He Is Risen". I think Gloria had a very similar Mercedes of her own (possibly a company car, though pretty flash for a saleswoman) which was a top of the range SL600, judging by the V12 badge on the side. It featured in Episode 3.12 "Armour Fou" where it's tires were slashed.
The 2004 Nissan Xterra SE that Tony bought for AJ in episode 5.4 "All Happy Families". This image is pretty poor but it's the only one I could find for now.
A Mercedes S-Class Mafia limo that Tony and his crew rode around in in Naples in episode 2.4 "Commendatori"