This book is excellent. It covers absolutely everything. Initially, I bought 'Build Your Own Computer' by Kyle MacRae but was very disappointed at the lack of detail (plenty of large pictures to pad the book out but not much else).
The 'Building a PC' book is written very concisely and packs an amazing amount of information into its 192 pages. As I discovered, the most difficult part of building a computer is knowing which components to buy. This book explains all the important specifications for each component, and thanks to it I was able to buy the correct parts for my purpose (a high performance gaming machine).
There is also a very useful troubleshooting chapter that explains exactly what to do if the finished PC doesn't work.
Anyone looking to build their own computer needs to get this book.