Volvo C30 I'd say it's weird because it's kinda half way between a coupe and a hatch. The 2.4 i5 diesel was really fast, my uncle had one (he's been through about 7 company cars in the last 14 years.)
Well, since I am the only weirdo that seems to even remember this car, I guess it would fit in this category pretty nicely. Vector W8 I also really like the Lamborghini LM002 for some reason... it's just so crazy it is awesome!
I think this should be in the Automobiles category. Anyway, I like this: I love its quantum carburetor:
wuba luba dub dub OT: On a more serious note I always liked the cizeta v16t. The engine was something that went off the beaten path and that interested me a lot.