This one is an easy one. Eric Decker a year ago was really the only consistent option in the Jets passing game, recording 74 catches and 5 touchdowns. Now, he has a Pro Bowl caliber receiver lining up across from him. Marshall should allow for Decker to get a lot more one on one coverage, as Marshall will probably see a lot of double teams. I only expect Decker's numbers to increase as a result of this move, and if healthy I can see both receivers recording over 1,000 yards next season.
2) Geno Smith
Obviously when you trade for Brandon Marshall, the quarterback will reap the rewards. Geno Smith has been so inconsistent over his first two seasons, but ended his sophomore year with a bang in Miami. Geno would appear to be a great fit for Chan Gailey's offense, as it is a similar style that he ran at West Virginia. With the new offense and the addition of Brandon Marshall, I think you have to give Geno a legit chance to be the starting quarterback this upcoming season.
3) Mike Maccagnan
Mike Maccagan is not a player, but the general manager of the Jets won over a ton of people today. Trading a fifth round pick for Brandon Marshall is a pretty amazing first move as an NFL GM. Jets fans now believe Maccagnan will be aggressive, a trait his predecessor did not have. The move fills a huge need and eliminates the talk of the Jets drafting a receiver at six. After this move, it will be interesting to see what he has up his sleeve for next week.