The Indianapolis Colts have Peyton Manning listed as doubtful for their opening game against the Houston Texans. If you're wondering who their back up QB is, it's Kerry Collins.
He hasn't played much this pre-season, but you don't get to play 17 years in the NFL without being a solid QB. After playing very sparingly the first 12 games of 2010, he finished strong, throwing 9 TDs, 3 INTS, and 1,000 yards during the last four games.
If your looking for a QB is week one, Collins would be a solid option. He won't be a starter one Peyton is healthy again, but depending on the extent of Manning's injury, you may want to handcuff him together.