I recently wrote a book about administering Unix and Linux servers with the aid of the friendly and versatile utility called Webmin. The book covers a wide variety of topics, from setting up and securing a new server to running and monitoring databases (MySQL, Postgres), a web server (Apache) and a mail server (Postfix).
The book is written as a series of 120 step-by-step recipes, which should be easily accessible to both novice and professional system administrators. Check it out to see how Webmin can make your life easier. The book is currently available from Packt Publishing.