With XML being the latest and greatest craze, I thought this might be useful to someone out there.

FastTemplate is an PHP extension for mamanging templates and performing variable interpolation.

Xtensible Shopping Bag (XSB), which besides storing standard properties (product id, product name, price, quantity) allows you to add as many custom properties as you like.

The Personal Open Directory calls the Netscape Open Directory (a mirror of the Open Directory Project, and a site which is better networked that ODP itself) to provide you and your users with a Web experience which looks like they've never left your site.

Ektron eWebEditPro+XML is the leading browser-based XML editor