The Pen Gets Mightier

The Johan Santana trade may benefit the Mets most because of the impact it will have on the bullpen. Replacing Tom Glavine (essentially what Santana is doing) with a guy who can consistently throw 7 or 8 innings per start should give the bullpen some added rest, particularly down the stretch.
Tom Glavine did throw 200 1/3 innnings last year (that 1/3 just hangs there, a constant reminder), but if Santana can go 230 innings, that's an average of 1 fewer inning per start out of the bullpen.
I assume Billy Wagner will have another good year as the Mets closer with between 5 and 7 blown saves, which isn't terrible provided they don't all come at once.
I expect Duaner Sanchez to bounce back and have another good year and Aaron Heilman, whom I hate, has been consistent if not spectacular over his career in the bullpen.
From the left side the Mets have Pedro Feliciano who is excellent, and Scott Schoeneweis who should bounce back, especially if he can be used more effectively (read: less often).
That leaves Jorge Sosa, who I think can be really effective, as the long man.
Joe Smith and Matt Wise for the last spot on the 12 man staff.
The key to this bullpen and any bullpen will be how the guys are used. Some guys are better facing only lefties, or only righties. Some guys can't come in with men already on base, others are great and inducing ground ball double plays to escape jams.
But I think the acquisition of Santana will improve the bullpen more than getting any single reliever would have.