As a preview of their upcoming issue, PHP Magazine has posted information about an article - Making Money Online with PHP.

In the upcoming Issue, 01.2005, of the International PHP Magazine (Print Edition), Bard Farstad will show you how to make money online with PHP. The article will cover a typical business case for setting up an eZ publish system and using the integrated e-commerce functionality. Subscribe to the International PHP Magazine (Print Edition).

While we are there, a stable & major bugfix release of the open source content management system, eZ publish, is now available. Outside of several bugfixes and enhancements, this release includes a workaround for a fatal PHP bug. For the full list of changes, refer to the changelog. eZ publish is dual licenced between GPL and the eZ publish professional licence.

Unfortunately, the article mentioned isn't posted on the site, but they do have a lot of the information linked that can help you get started.