I've finished reading "Professional F# 2.0"

I've finished reading Professional F# 2.0. This book is useful for learning F# at first, especially Part0 ~ Part III. But to read this book requires some prerequisites.

1. Minimum knowledge of OCaml - this book does not contain any explanations about let in clause.
2. Minimum knowledge of CLR - but that is covered in .NET Book Zero

Contents in Part IV are slightly out of date and slightly out of need. And there are no contents about any kinds of side effects or monads. But, say again, this book is useful for learning F# at first.