OpenX is for personal website use. It's not really member based, out of the box. You can assign clients and logins. And it makes a great addition to existing CMS blogs, forums, and sites that already have a member based system. OpenX is an open source ad framework. Most cPanel hosting websites have a version of Openx or phpads that can be installed using Fantastico. Fantastico is a simple PHP script select and install interface that lets anyone without knowledge of PHP scripts, install the scripts on it's list, automatically. Openx developers require a ridiculous amount of money to be paid for them to install the software on your server for you. It's alot easier to just buy a shared server that has cPanel and Fantastico. Most Linux based servers use cPanel hosting. OpenX is a really basic AdBrite Clone or AdSense Clone. It lacks an up to date user interface and user registration depends on your existing member based CMS.