I don't think it's a bad trade for Lakers, because of what some have pointed... it's like when the Celtics traded for Ray Ray to get KG. The BIG difference is Orlando's GM would be crazy, and public enemy #1 if he traded Howard to the Lakers, unless they are getting Kobe Bryant. It would make sense for the Lakers, of course, but that's not going to happen.
So the Lakers and Howard will wait until next summer, and then sign him as a FA (Howard will loose money on his new contract, but he'll be the new Lakers "big center" and that will mean lots of money).
Because of that, the 2011-2012 Lakers will be a big if in the West. They are losing their best two players in the 2010 Finals, but they just acquired the best PG in the league. Injuries could play a factor also, so in my opinion, they're not the favorites to get out of the west. In 2012-2013, with Dwight and CP3... maybe. But not now.
Clearly, the trade is worse for CP3, who will have to share the ball with Mr. Ballhog himself, Co-b. Our Big 3 have shown their sacrifice for the team, while his new teammates are, at best case, crazy (Metta World Peace). I can't wait to see Bryant blaming CP3 for not passing enough.
As for the Celtics, the only PG I'd trade Rondo for is a Laker now, so we'd better enjoy having Rondo. We have our chances, maybe not to land DH12, but to find an athletic rebounding/blocking/defense machine to pair him with RR and some scorers at the wing. The Wilt Lakers were also going to dominate the league, but you all know what happened.
Go Celtics!