"PhpDelicious is a PHP 5 library for accessing the del.icio.us API. It combines data from the main REST and JSON APIs and presents a consolidated interface. It also implements a file based caching system which eliminates the need to query on every request and ensures access to the API won't be throttled due to excessive requests."
[Through implementing this PHP 5 library bookmarks can be implicitly published to an existing delicious account i.e. published without first needing to navigate to your page on the delicious.com web site.]