OK, this is a move I can get behind, and it validates the trade for Ray Allen somewhat.
Kevin Garnett is still one of the five best players in the NBA and he should be able to maul the light Eastern Conference, esp. with Pierce and Allen on the team. My understanding is that Al Jefferson is a real talent who will be missed. But it is doubtful that he will ever be at Garnett's level. I'm psyched.
Also, the Red Sox grabbed Eric Gagne, who a few years back was the best reliever in baseball by far. He's not at the same level any more, but the key aspect of this trade is to keep him off the Yankees. The Yankees' bullpen is awful except for Mo Rivera, and bringing in Gagne as a set-up guy would have made them very hard to beat late in the game. For the Sox, Gagne, Okajima, and Papelbon makes for quite possibly the best Red Sox bullpen ever.