Now, the longer review...
The last major part covers Ajax - one chapter goes into nice detail and builds several helpful library functions. He also covers handling the return of these requests and the pros/cons of xml vs html vs json. And then it goes into two bigger projects enhanced blogs, autocomplete and wiki.
There's not much negative to say about this. It gives a great overview for those who don't know the language inside and out, it covers a huge number of topics in a very readable and instructive way and gives a very useful reference to DOM and event scripting at the end. It does suffer slightly from putting some code in that is unexplained until a future point in the book. But, it doesn't happen often.