If you’re using Joomla, the PHP-based open source CMS, you may want to have a look at “Anna’s Joomla Tips”; a collection of some fairly simple but very useful tips and tricks.
You’ll find Anna’s tips on the Joomla forum: forum.joomla.org/index.php/topic,5503.0.html
If you haven’t had a look at Joomla yet, you might want to have a quick peek on www.joomla.org.