I'd label Apache the Definitive Guide as having a strong introduction tutorial, and impressive advanced material on the SSI, API and Modules.

But the Guide is weak in the middle ground. I wanted more sample configuration statements with a carefully complete description. I wanted to see the authors address the larger context that Apache runs in: websites.

The preface very carefully escaped the authors from dealing with the larger issues of web site design.

Apache is like an elephant with 150 configuration variables. I ask the authors on their next edition to step back and show me how to do a few simple things with newbie level explicitness.

Next edition: Show me how to enable a specific directory for READ or POST or GET. Have the authors show how to go from a functional specification to lines in the .CONf files.