To copy and paste from my intro...
I've been playing with real cars for the last 25+ years (before that, I was building models and drawing/reading about them). I've been building customs, show cars, race cars, street rods, etc. I've owned over a hundred cars, from most major manufacuters (and a few minor ones...). I had a shop for many years, and built hundreds of customs and race cars, as well as doing crash repair on sports cars.
I've been autocrossing for a couple decades, as well as doing driver instruction in SCCA and BSCC. I've crewed on a few road race teams, including an IMSA RS Mazda RX3 team that also campaigned a rotary powered Formula Libre. I've helped build a few national championship winning SCCA autocrossers and road racers (like Greg Fordahl's national championship winning Porsche 914s and Porsche GT3s). I've driven hundreds of different cars on the track, from cheap basic cars to Porsches, Ferraris, and a couple Lotus' (from an old Elan to a newer Esprit V8).
The largest single type of car I've owned is custom air cooled VWs (over 30 of 'em), but I've had everything from big block Chevelles to rotary powered autocross cars.
My last, most famous car on the internet was my V8 powered RX7.
My current collection includes the family car: a 2002 5 speed touring edition PT Cruiser that my wife and I autocrossed for a season (netting third place for the season in H Stock). I also have 2 '86 Jaguar XJ6 Series III (you have to have two in order to keep one running...), an '81 Fiat 124 Spider I'm driving right now (and finishing up the restoration on: http://mywebpages.comcast.net/cvetters3/fiat_spyder.htm
I've built cars from the ground up, rebuilt destroyed cars, and more. I hate doing straight mechanical fault diagnosis, however.