I have just completed his book, in which he discusses the up and coming nations, the "rise of the rest" as he calls it.
I found it to be an extremely easy read, Zakaria doesn't make you feel as though you need a degree in economics or poli sci to understand it.
I highly recommend it, every American should read it, it is that important. Americans need to realize that, as a nation, the United States shift in hegemony has to be addressed. Peace, Searchers!