phpODP enables you to add the content of The Open Directory Project at dmoz.org, with site thumbnails to your own website. Let your users search or browse the categories. Also supports targeted advertising. Everything is template based, which means that changing the look of your own Open Directory is as easy as browsing the Kids category on dmoz.org. The content is collected from ODP in real time. When they update, you update. Includes the ability to display a targeted Amazon.com sponsored link on searching/browsing. (eg. if the user searches for "php" a link to "Search for books on php" to amazon.com is shown. This is optional.
Version 1.5d also supports caching of browsing and/or searches for optimal performance. Note; dmoz.org also contain adult material - phpODP lets you block these categories, in addition to blocking specific searches.