Here is a demo of my url shortening script. It let your visitors to make short redirections of their very long url's (for example it is useful for twitter users where they are limited to 140 characters). Script is made to be as simple as possible. HTML is separated from PHP so it may be customized by editing one HTML file without touching any PHP code! It do not need MySQL database - all data is stored in the file system. Users are redirected by .htaccess file to desired shortcut. Additionally there is administrator backend module to manage (edit/add/delete) url shortcuts. Below you may click for demo installed on my dev server.
You may get a copy of this script for $30 (installation included) - contact me if interested.
Update: Free version of this script have been released. Click here for more details.