Apache Security - The Complete Guide to Securing Your Apache Web Server: "This all-purpose guide for locking down Apache arms readers with all the information they need to securely deploy applications. Administrators and programmers alike will benefit from a concise introduction to the theory of securing Apache, plus a wealth of practical advice and real-life examples. Topics covered include installation, server sharing, logging and monitoring, web applications, PHP and SSL/TLS, and more."
This book is a must read for anyone who maintains web security, and not just for Apache/PHP admins. The security topics and concepts are applicable in whatever environment you are maintaining. And go add Ivan Ristic's blog to your RSS feeds to stay up to date
http://www.modsecurity.org/blog/
Stay Secure! -Bryan
