Here is a list of other Linux sites that you might find useful.
Linux Documentation Project
Huge quantities of Linux documentation, including HOWTOs, man pages, FAQ’s, etc.
Linux.com
Linux information, software, documentation, how-tos, and answers
JustLinux
Linux Help Forums
LinuxForums
More Linux Forums
SourceForge
Search site for open source software
RPMFind
Search site for Red Hat Package Manager compatible software packages
Linux Today
Linux and open source news
Using Access Control Lists on Linux
A tutorial showing how to enable Linux Access Control Lists and some basic ACL permissions