Apache htaccess Ultimate GuideSource: www.askapache.com
Apache Web Server .htaccess and httpd.conf code snippets and examples that I use all the time. There is a lot of gold sprinkled throughout this article, and its updated almost daily, so take your time, come back often, and look at every example so you don't miss any treasure! ...
We killed the www prefixSource: nostatus.com
The "www" prefix is considered deprecated these days. This is a method to removed the prefixed "www" part of the domain. It also creates a shorter URL.
404 Searches with htaccessSource: newearthonline.co.uk
Today it is simply not enough to redirect a user to a generic "Page cannot be found" 404 page. In the spirit in trying to give your users the best possible experience they should be redirected to a page that tries to help them find what they were after.
Using htaccess for scheduled downtimeSource: newearthonline.co.uk
Sometimes you may find that your site needs to be innaccessible for a short period of time whilst updates are performed, such as updates to user logins.
Merging domains the correct waySource: newearthonline.co.uk
Own multiple domains and want the same content on them all? Here's the correct and optimal way of doing it on an Apache based server using a htaccess file.

Permanet links, or permalinks for you cool people, are most commonly used on blogs, however they can be implemented in many place including blogs, tutorial sites, article sites, etc. What a permalink, is just what it sounds like, a permanet, rememberable link to the current page.