My parents live in tha Monterey Bay Area - home of the Pebble Beach Concourse. There are always amazing cars in the area, but during the week leading up to the Concourse, fuhgeddaboudit. You can’t spit without hitting a vintage Ferrari, Porsche, Muscle Car/Vette or modern supercar, e.g. multiple Bugatti Veyron sightings per day. And the little, cool curiosity cars are out in force, too - Nash Mteropolitans, original Mini’s and early Jags. Makes your head spin.
In Berkeley, with a commute that takes me through San Francisco? Yikes.
Things, the occasional Delorean, original VW bugs with the flat, split windshield, Pierce Arrows, Tesla roadsters, cars that have had all manner of odd shit glued to them (bobblehead heads, corks, living plants…), Woodie wagons… I saw a Thing this morning that had had an H2 conversion–there was a squared-off passenger compartment with the tiny little truck bed in the back. It was very cute. Plus, the usual uber-luxury cars on a Friday or Saturday night, heading into the city.
Oh, yeah… I saw a Volvo Duett a few months ago. Awesome car…
Someone around here has a Dodge Charger painted up as The General Lee, in the summer months you occassionally see him and a friend driving it around while wearing cowboy hats, its pretty fun and neat actually.
And they’re really big cars when compared to all the European/Japanese cars on the road around it!
Someone also has a De Lorean, I remember driving past it and the driver having a huge grin on his face, he’d obviously been given a drive by the owner!
Until his recent passing, my neighbor across the street had a 1937 Cadillac V-16. A gentleman down the street has a Ford Model T, and a Model A truck. There’s a Jeepster nearby, and a guy who collects and restores old Chevy Chevelles and Novas.
I got behind a 1965 Chevy Nova Yenkomodel, and followed it the other day. Turns out it’s my Chevy guy. I pulled in behind him in the driveway to ask how he found this car since I didn’t think Yenko started building them until 1969 or so.
He confessed it’s a fake/homage that he made from a regular Nova.
When I have them here, my older Jaguars and MGs seem to be community favorites. My daughter used to like to be picked up from school in my sidecar, or my MG-TC or TR-3, but now that she’s 15 I am forbidden anything unusual, and the radio must be turned off 1/4 mile from school, lest anyone hear my godawful music.
There’s a wild MGB somewhere now and then, and another guy down the road has a stunning 1960 VW bug and a beautiful 23-window I’m thinking of swiping one dark and stormy night…
The fellow in the garage next to mine has, IIRC, a red Maserati. Not terribly rare, but not terribly common around here either. I very rarely see it. I’ve spotted a Tesla around town as well, though I forget exactly where.
I’ve always wanted an Amphicar. 
There are quite a few Fisker Karmas around here. Lovely looking things; shame they went bust. There’s also a mint DeLorean within spitting distance from my office (where I am now). It’s been sitting on the forecourt of an auto repair/sale place for a few months; I assume it’s just there to drum up interest.
I’m fortunate enough to live in an exotic car mecca rivaled only by Hollywood and Dubai.
Aston Martins, Ferraris, Maseratis, Lamborghinis, Porsches, Bentleys… you name it, it’s a multiple times a day occurance. Enough to make one jaded about the run of the mill flagship Mercedes, Jaguar, BMW and Audis.
I saw a mid-60’s (?) Fiat 500 parked down the street the other day. It was gone this weekend, not sure if it lives here or was just passing through.
Oh yeah, I forgot that there are no less then 5 Datsun Z-cars around here. And the people across the street had a P1800, too. So two of them on the same street until they moved away!
We seem to have a lot of late-model Mitsubishis around here. Which is wierd when you realize what a tiny percentage of the market share they have these days.
I’m not sure it qualifies as a “car,” but someone around here has a huge 4-person bicycle. People sit on it in a 2x2 arrangement. It’s really cool.
Someone near where my husband works has a van painted up like the Mystery Machine.
A neighbor has a '72 or '73 Grand Turino in gold.
Another neighbor has a Nash Metropolitan rotting in his field 
I used to pass a garage with two Yugos on my way to work. Well, truth be told, it was one car made of two Yugo front ends welded together - the sign said it was a “Wego”.
Buckhead is the high-income neighborhood of Atlanta. Working down there gives a car guy like me something nice to see every day. I can think of 3 different Veyrons that cruise by in a week; Bently, Rolls-Royce, and Ferarri are well-represented in any 30 minute span.
My wife and I will have lunch outside along Piedmont or Roswell Road most days, and I’m always jumping up and saying “look at that!” while she ignores me. She hates giving any nice car attention for some reason. I don’t understand it, and her therapist isn’t making any progress at all!
Raises Hand…my neighbor has three C6 Corvettes. Two of 'em are Z06’s.
My Garage, in addition to the Subaru STi and '03 Avalanche has a 1998 Supercharged Corvette, a 1989 383 Corvette, a 1966 Cadillac S&S Victoria Hearse, a 2005 BMW K1200LT (motorcycle) and a 1964 Honda Benly (Motorcycle).
Partial Proof here:
http://farm8.staticflickr.com/7337/9594393528_0c50f7729a_c.jpg
There aren’t really any unusual cars in my neighborhood per se, but I do live in Carlisle, Pennsylvania and for eleven weekends a year, my town is overrun with unusual cars of various sorts. Last weekend’s Corvette show had at least one of literally every kind of Corvette made. Same for Ford, GM, Chrysler, and all the other shows. The traffic in town during a car show sucks, but at least it’s interesting traffic.
In walking around with my dog I note that quite a few of my neighbors have old cars. A red (or once red) Karmann Ghia, a vintage Corvair, and four, count 'em, four Datsun 2000s.
The Datsuns are not all in the same place. They are not even on the same street.
There’s also a guy who has an old MG frame out for sale. He’s been putting it out along with the For Sale sign for five years. This car has no engine. Also, no takers.