The 'true hacker!' blog has a new post today that gives you a quick four step process for creating some clean, Digg-style URLs for your site with some simple Apache configuration changes (mod_rewrite).
You might have noticed that Digg has a cool way of maintaining clean URLs. Digg actually uses LAMP - Linux/Apache/MySQL/PHP. But where are the .php extensions? The answer is here. 4 steps to implement your own Digg style clean URLs.
His method turns on Apache's rewrite engine (you do have mod_rewrite enabled, don't you?) and adds a rule to push all of the requests to two default PHP files. There's also a ForceType method that can be used to achieve the same effect. One .htaccess file later, you're in business and the PHP script only needs to access the $_SERVER['REQUEST_URI'] value to get the parameters.