#1 will always be Joe Montana. Brett Favre announced his intention to retire today. He’s not quite going out on top like Elway did, but pretty darn close. He came back from a disastrous season two years ago to bring the Packers to the brink of the Super Bowl for the first time in many years.
PS – Considering I basically grew up at the old Stanford Stadium, the fact that Favre overtook Elway as #2 quarterback is a big deal.