The Titans have signed John David Booty to the practice squad and he will serve as the #3 QB on the Titans.  This might be the kind of move that leads to a switch to Vince Young at QB as Booty is a younger player who could be a long term backup for the Titans.  It’s possible that the Titans could consider cutting Kerry Collins and going with youth at QB although I think that would be a huge mistake as Booty doesn’t have any game experience.