Here's a summary and some thoughts:
Middle Linebacker: Considered to be the most watched competition in camp as Jonathan Goff, Phillip Dillard, Gerris Wilkinson, and Chase Blackburn try to convince coaches that they have what it takes to replace Antonio Pierce. Goff is said to be the early leader.
Defensive Ends: Osi Umenyiora and Mathias Kiwanuka. This should be fun. Umenyiora said a while back that he would rather retire than not start, then thought he'd be traded, and now wants his old job back. He impressed during OTAs. Kiwanuka is entering the final year of his contract so you know he wants to start. And then there's first-round pick Jason Pierre-Paul. Whoever winds up starting will line up opposite Justin Tuck.
Perry Fewell: The Giants' new defensive coordinator is in the spotlight, and it will stay that way for a long time. Big Blue's defensive struggles last season have been well-chronicled. Over the next three days, Fewell has to teach his system, get his players to learn his many schemes, and evaluate talent. He's got pieces on defense. Now he has to put it all together and make it work.
Running Backs: Brandon Jacobs and Ahmad Bradshaw were hurt last year and both underwent offseason surgeries. The Giants are counting on Jacobs to return to form. If he does, this offense will be very good.
Safeties: I wrote about this yesterday. Antrel Rolle and Deon Grant are major upgrades. Kenny Phillips is still recovering from knee surgery. Rookie Chad Jones will also get a shot.
It all gets started today. Should be a fun three days.