Nearly two years ago, I wrote a utility to check your del.icio.us tags for duplication using Porter stemming. Until today, the application had stopped working completely due to the fragility of the screenscraping code it was using. For fun, I’ve done a rewrite using Ruby and Hpricot, with all-new fragile screenscraping code based on the del.icio.us JSON feeds (thanks to Lenny Domnitser for pointer