Rating: 

Although pedagogy is an important part of the software, don’t look for much depth here. It’s written by techies, not teachers.

Also, unlike user manuals for other kinds of commercial software (Word, Excel, etc), the guide is not specific to a certain version. As of this writing, the book is already out-of-date.

[Edit: 2006]

However, I when I wanted to learn about glossaries in moodle and how they work, I was able to look them up in this book, and immediately put one together and get it up and running in minutes.