mod_rewrite is very useful in many situations. Yet some behaviors were not so obvious when I started to mess with it. After many testings, I understand it much better, now. Having said that, I do not pretend to know it perfectly. I also make mistakes.
Htaccess
For the AskApache Google 404 WordPress Plugin update I added a new 404.php that is more advanced than anything previously seen for a 404.php
WordPress 404 PHP wordpress
Ever wanted to execute commands on your server through php? Now you can. I'm calling this file (see below) shell.php and it allows you to run commands on your web server with the same permissions that your php executable has.
Hacking AJAX PHP
Say you want to deny access to your entire site except when you access it. The following htaccess code does just that.
Instead of a Static IP you could also use a hostname, or part of a hostname..
Htaccess