Beware of the fast rising quarterback prospects in the draft. There's been too many instances where a guy goes from being a possible late round pick to a first round pick in the span of a few months only to become a complete flop in the NFL. This is why the quarterback position is the most difficult position to evaluate.
I'd honestly rather take someone that drops lower in the draft than the area he was projected than to take someone who used a great season and great workouts to improve his stock from a 5th-6th round pick to a 1st round pick.
Take Kyle Orton for instance. At one point, he was considered a possible first round pick. He had some injuries, and his Purdue team underachieved on the year. Kyle also didn't look good in the Senior Bowl practices. He fell to the 4th round. While many will talk about him getting benched in favor of Rex Grossman late in the year, I don't think anyone can argue that he has easily been the best rookie quarterback in the league. You have to be very careful with this position. Orton wasn't asked to make many big plays this season, but he was learning to do the one thing that may be the hardest for a rookie quarterback to learn. He knows how to manage the game. As he gains in experience and in confidence, I believe you will see the big plays emerge, and then people will talk about how he was a mid round steal when he probably should have been a first round pick to begin with.