You're putting some effort into contributing information to del.icio.us, and it repays you by exposing its data and functionality in several ways so that you can get it back again without asking any favors or getting special access. It has an HTTP API for posting and managing your account. Nearly every useful page has a related RSS feed, exposing not just the human-readable titles and links but also neatly structured machine-readable information on tags and authorship. Finally, for the odd bit of stuff not exposed through an API or RSS feed, the HTML is free of presentational fluff and cleanly marked up with useful CSS classes.