General Linux
From Klaus' wiki
Besides the specific pages for Centos and Fedora on this page there are links and hints for general Linux.
The GeekStuff is packed with hints and trix.
GHacks has a lot of trix at hand.
Bash One Liners is a fantastic place for bash trix in just one line.
Information at your fingertips using man
How to install an application for all users
Mount networkdrives when NetworkManager is ready
Here you can find a small utility for using the Logitech Unifying products on your favorite Linux.