Although it by no means guarantees success, quarterbacks blessed with abnormally strong arms are coveted by offensive coordinators and most of all scouts. Teams love to be able to call every route in the playbook, and with any of these quarterbacks, there will never be an issue with ball velocity or underthrowing the receiver.
In the history of the league, everybody can remember names like Brett Favre and John Elway. These quarterbacks made their names with their rocket passes and deep balls. However, there have been even more players like Derek Anderson and the infamous JaMarcus Russell, who could heave the pigskin a mile but struggled with other aspects of their trade, like reading coverages and passing with great accuracy and touch.
A disclaimer for this article is that my rankings are more or less totally subjective. There has never been a speed radar in the NFL, and when it comes down to it the difference between the strongest arms in the NFL is a couple of yards. If you disagree with the list or can think of anyone I forgot to mention, please inform me of that in the comments section.