Last year with Peyton Manning on the PUP the Colts brought in a pair of veteran backups, Quinn Gray and Jared Lorenzen. Now with Jim Sorgi out 2-3 weeks they may bring an experienced QB in again. There are still a few Quarterbacks with NFL experience remaining unsigned.
UFL (I don't know if there is an arrangement for the NFL-UFL on the poaching of their talent, but it's unlikely any of these guys will give up a starting UFL job for a few weeks in an NFL camp).
Brooks Bollinger (Orlando)
Quinn Gray (New York)
J.P. Losman (Las Vegas)
Jump for more info on the vets
Gus Frerotte (FA) last seen replacing a struggling Tarvaris Jackson and starting 11 games for the Vikings before a back injury took him out of the lineup. He completed 59.1% of his passes for 2,157 yards, 12TDs with 15 INTs for a QB Rating of 73.7 and ANY/A of 4.3.
Drew Henson (FA) most notable for sharing time with Tom Brady in college. Henson both thrown an NFL touchdown and has a major league hit. The downside being that he's thrown just 20 NFL passes (only 2 over the last 4 seasons) and had only 9 MLB at bats.
Craig Nall (FA) the long-time backup has the impressive statistic of more years in the league (9), than games played (7). He has played well in his few appearances holding a career QB rating of 123.8 over 48 attempts.
Marques Tuiasosopo (FA) A second round pick of the Raiders, Tuiasosopo has played just 13 games (2 starts) in 8 seasons, and hasn't posted a season with less INTs than TDs or a QB rating over 51 since his (4 attempt) rookie year. Awesome name though.
Cleo Lemon (FA) Lemon started half a season in Miami in 2007 playing well enough for an ill advised 3 year, 9 million dollar contract from the Jags, who cut him after just one year.
Brooks Bollinger (Orlando) Bollinger has played a handful of games as a backup since a mediocre half-season starting for the Jets with 56.4% completion, 1,558 yards, 7TDs, and 6INTs for a rating of 72.9 and 4.1 ANY/A
Quinn Gray (New York) We all saw Gray last year, through the first 3 preseason games he looked like the best QB of the 3 headed backup committee. Over the last two he threw 4 INTs to 1 TD and completed under 40% of his passes. He eventually caught on with the Cheifs where he had 8 very good pass attempts.
J.P. Losman (Las Vegas) The 2004 1st rounder couldn't stay healthy and regressed as a passer after a pretty good 2006 season. With Trent Edwards emerging as a viable starter and outplaying Losman, J.P. was given the boot.