I could see the Vikings (24), Packers (27), and Broncos (32) all possibly moving up if one of their favorite players slides a bit. Teams that are good and think they're one or two key players away from being Superbowl contenders are sometimes willing to move up and grab their guy. But, you never know with the draft. It's a crazy time and all sorts of trades and moves are made come draft day.
Also, a team that's already picked in the 1st round may like another player so much they're willing to trade next year's 1st rounder along with a couple others to make it happen. You just never know.
"The Dallas Cowboys have 2 types of plays in their playbook: Passing plays, and running plays." -John Madden