Lets Start with the Giants,
The Giants had a strong start the the season and fell apart. Some blame it on poor coaching. Some lack of execution.
The Giants had a very quiet off season but needed to do very little as far as personnel. They should have a similar type of season.
The Eagles did not lose a step with the Donovan McNabb trade. Kolb had three full off seasons and a few games to show the Eagles brass what he could do behind center. Kolb was very impressive with the two games he had in the 2009 season.
The Eagles also had a busy off season, cutting almost everyone over 30 and bringing in young and explosive talent. The Draft was no exception as they chose 13 players, most of them on defense.
Bringing in McNabb was only one piece of the pie. The also have Shanahan. Mike Shanahan is known for taking a lack luster team and turning them around in one or two seasons.
The Redskins have been lacking a good head coach since the last coming of Joe Gibbs. They also brought in Back field help (in Larry Johnson and Willie Parker) and had a very strong draft. They continue to bring in players to contribute to the team.
Dallas has made little to no effort to improve their team. While they seem content with their first Post-season win in 13 years. All other Teams in the East have been making huge splashes in this off season to strengthen their soft spots.
The Cowboys soon may realize that it is too late to make any impact on the season.