I don't really think the Spurs choked. They've always played that way. They are generally an extremely disciplined team that every once in a while can fall into bouts of chaos. And they're not used to that, so they tend to fail when that happens. Up until the final moments they had a chance, and generally made good decisions that just didn't paid off. If Duncan had made that shot over Battier, the result might have been vastly different.
I think the most important thing is that LeBron stepped up in Game 7 into something worthy of what he (and his fans) thinks of himself. He was wishy-washy for all of six games and played stellar in the game that counted. If that Game 6 Ray Allen shot had not fallen in, this Finals would have been remembered as the Finals LeBron sleep-walked through. Of course, it helped that Wade and BOsh woke up at around the same time.
I honestly don't like Miami winning the championship. I don't think arrogance should be rewarded and am not looking forward to some of my friends gloating. However, they did play great that last game and deserve this win.