I needed to get a listserver up and running in two weeks... I knew perl and linux... O'Reilly came to the rescue.
Managing Mailing Lists helped me choose the right MLM, install it, and configure it with little to no hassle. I would like to have seen the book focus on majordomo solely, since the others probably have software manuals and are supported by their vendors. But the info was adequate, and the other chapters on LISTSERV, ListProc, and SmartList helped thicken the book up so that it fits nicely on my O'Reilly bookshelf..
The book had quite a few typos, some contradictions, and even some misprints that downright hosed up performance and functionality. But once I got through the installation, I was able to go back and easily spot the errors, as the book does a good job explaining the what's and why's of its code. (if the editor reads this, please contact me for a list of corrections for the next edition)
As far as I know it's the only book on majordomo. With a step by step approach (a simple method I wish more books would follow these days) and great hints and tips (BTW, excellent loop-check script incl.) this book gets a 4/5 from me. Typos on critical info/code knocks a point. Second ed. should remedy that... *-)