The two most commonly named are John Unitas and Joe Montana.
Using quarterback rating, through the 2007 season that would be Steve Young who had a career quarterback rating of 96.8. Peyton Manning is second all time at 94.7 and Kurt Warner third at 93.2.
RoboQB or Robo Quarterback due to his efficiency.
jamarcuss russel by far
Archie Manning
Chuck Long
Roger Staubach
Not all just some
Brett Favre is THE toughest quarterback ever. He is also the BEST quarterback ever.
As of 23 October it's Cam Newton for Auburn.
Statistically, Brett Farve
Brett Favre