Ben Nadel is an expert. I'm usually pretty skeptical when I see/hear the word expert, but in this case it is true. His resume not only speaks for itself, but his presentations and previous work speak more volumes than his resume ever could. His extensive look at JQuery is one of the best explanations I have ever heard on it; and extremely accessible to people new to JQuery. I'm not new to JQuery and it gave me a ton of "Ah-ha!" moments where I groked things I hadn't realized I did not get.