There have been a couple big moves so far this offseason in the NBA, but they really aren't that big. They are big names, but the impact won't be big, at least not in a positive way.
Ron Artest brings a shutdown defender to the Lakers, already a good defensive squad(when they try). He allows Kobe to slack off even more on defense so that Kobe can save his energy for offense. However, I think this is a lateral move at best. Artest is not a disciplined offensive player and seems like a terrible fit for the triangle offense. He likes to take over at the end of the game, too much in fact, I don't think Kobe will tolerate it. The Lakers ditch the triangle at the end of games and defer to Kobe. You'd think that they would continue to bring in players to compliment Kobe. Instead they bring in a guy who holds the ball too long and embarks on wild forays into the lane. This won't end well.
Bringing in Shaq to defend Dwight Howard continues to send the Cavs on the complete opposite direction that they should be in. A slow, plodding, aging center who can't run the floor and can't defend the pick and roll(something Orlando loves to run) seems like a terrible idea.
The Magic don't need Vince Carter. The team is a finals caliber team when Jameer Nelson is healthy, a penetrating point guard, shooters and an athletic center to grab the rebound doesn't need a guy who takes games off and sole concern is scoring.