This is a great introduction to building web apps in Go. (I started roughly two months ago, but had this book been around, I'd have been brought up to speed a lot faster).
Here's why: the predominant approach to building web apps in Go is to build on top of standard interfaces (e.g. net/http), and to keep things as simple as possible. Heavy, prescriptive frameworks are frowned upon. This is a great approach, but probably strange to people (like me) who come from prescriptive frameworks like Rails or Django.
Jeremy's guide sticks to Go conventions, while respectfully suggesting lightweight libraries that complement this approach. The guide is never "YOU MUST USE THIS", instead it always introduces the bare-bones approach first, and then tells you "hey, there's a 3rd party library that gives you some useful shortcuts on top of those." And indeed, each of the recommended libraries are idiomatic and easy to understand.
My review is probably biased, though, because I now have some idea now of how to write web apps in Go. But I certainly wished this book had existed when I first started.