I know what #7 is.

http://carcloseups.mtv.co.uk/

edit... I figured out you got instant check, so here are the ones I had right

#2 Lotus Elise
#3 Suby Impreza
#4 Ford Focus
#5 Ford Escort
#6 Mini Cooper
#7
#8 Lambo Murcielago
#9 Ford GT40
#10 ???
#11 Pagani Zonda
#12 ???
#13 Mercedes (type unknown)
#14 RR (type unknown)
#15 ???
#16 Ferrari Testarossa
#17 Austin Mini
#18 Jag e-type
#19 Porsche Cayman
#20 Ferrari Enzo
#21 Lancia Delta Integrale
#22 VW Golf
#23 ???
#24 Citroën 2CV
#25 Renault 5 turbo

I got 42 of 50... Cant get 12, 14, 17 or 25

BJH

1 Volkswagen Beetle
2 Lotus Elise
3 Subaru Impreza
4 Ford Focus (ST to be exact)
5 Ford Escort
6 Mini Cooper
7 Porsche 914 (looks like a 916 front bumper)
8 Lamborghini Murcielago
9 Ford GT-40
10 dont know...looks liek a saleen S7
11 Pagani Zonda
12 Dont Know
13 Mercedes SLR (should be Mercedes Mclaren)
14 Rolls Royce Phantom
15 Dont Know
16 Ferrari Testarossa
17 Dont Know
18 Dont Know (looks like a datsun)
19 Porsche Cayman
20 Ferrari Enzo
21 Dont Know
22 Volkswagen Golf
23 Ferrari F-40
24 Dont Know
25 Dont Know

43/50

Can't seem to completely get:

#10________________
#14 RR ____________
#15 Citroen _________
#21 Lancia __________
#25 Renault _________

I just figured out you get the answer as you type...
Edited my post above

1 Volkswagen Beetle
2 Lotus Elise
3 Subaru Impreza
4 Ford Focus
5 Ford Escort
6 Mini Cooper
7 Porsche 914
8 Lamborghini Murcielago
9 Ford GT40
10 Mclaren F1
11 Pagani Zonda
12 Morris Minor
13 Mercedes SLR
14 Rolls Royce Phantom
15 Citroen Saxo
16 Ferrari Testarossa
17 Austin Mini
18 Jaguar E Typr
19 Porsche Cayman
20 Ferrari Enzo
21 Lancia Delta Integrale
22 Volkswagen Golf
23 Ferrari F40
24 Citroen 2CV
25 Renault 5 Turbo

50/50

I found that fairly easy but they're all European cars. I wouldn't have got half of them if they were from your side of the pond