The New York Times has a nice, 6:30 video on the evolution of the crossover dribble, and D. Wade, as you might expect, figures prominently:
http://video.nytimes.com/video/2011/05/25/sports/basketball/100000000831937/the-crossover-on-display.html
If D Wade finds his j, the crossover could be more lethal. Brewer has done a good job on Wade.
I think they are doing a great job on Wade, Brewer is ok playing tight on him and then playing him, once DW goes past him, from behind since Noah/Boozer/Gibson always have their eyes on him too. When someone is playing you from behind its very hard to take that pull up. Philly/Celtics tried to do the same thing, but weren't as effective.