I really like Okinawa's selection's and for sure those were stunning drivers (Clay was great) but these are my favourites:
The legend, the best one, the greatest, the incredible, "Nivola", il Mantovano volante, Tazio Nuvolari

You just have to think about this pic. He was racing and suddenly the steering wheel came off and he put a pipe wrench to keep driving his car. Than he passed trough the pit lane and he threw the steering wheel to his mechanics without stopping to repair it (this pic is about that precise moment). He made 15 laps to finish the race with the pipe wrench instead of the steering wheel... on a 1939 car...

HE was the inventor of the drift (in those years with those cars that was the fastest way to drive a car)and he made many AMAZING deeds (just search Tazio Nuvolari on Google).
IMO the BEST DRIVER EVER!!! THE LEGEND!!!
Than I put, from the older to the most recent, some other drivers that IMO, have written a piece of motorsport history:
Circuit racing:
Alberto Ascari, Jacky Ickx, Stefan Bellof, Gilles Villeneuve, Ayrton Senna, Alain Prost, Michael Schumacher.
Rallying:
Sandro Munari, Walter Rohrl (The best rally driver ever), Markku Alen, Henri Toivonen, Jean Ragnotti, Colin McRae, Sebastien Loeb.
RC
Hit the banner for my garage

SE SEI INCERTO TIENI APERTO!!!
Sorry for my bad English...