Apache Mod Rewrite
From assela Pathirana
Mod_rewrite, the Apache web server's URL rewriting utility, allows the translation of client requests based on a number of rules. For example:
RewriteRule ^oldstuff\.html$ newstuff.html
will translate a request named oldstuff.html to newstuff.html before it is requested from the server.
Following are a set of useful resources for using mod_rewrite