With Manny to the Dodgers, I'd say the Marlins cannot win. They didn't get a catcher, which they desperately need, since they are playing a 3d stringer. And they didn't get a big bat.
The Dodgers are now loaded in the outfield with Manny, Kemp and Ethier. Juan Pierre and Andruw Jones shouldn't, but will, receive more plate appearances this year. I bet the Dodgers let those stones drag them down simply because they are paying big money. It would be smarter to recognize they were stupid signings, and play the real talents.
The Dodgers are obviously counting on Casey Blake at 3b, at least this year. He's 32 years old, so he is not the future. I suppose Blake DeWitt showed them enough at 3b for them to find LaRoche expendable. A little surprising, but at least they made their move.
Boston is a weaker team at the moment. Bay is not as good a hitter as Manny, which means he won't adapt to the AL pitching as fast as Manny will adapt to the NL pitching. But, he will have the Green Monster, and he's a better defensive player.
Pittsburgh? What difference does it make? Andy LaRoche is a serious prospect and gets reunited with his brother Adam. Not much else to say.