- Delicious Safari, a commercial Safari plugin that is almost (but not quite) as good as the official Firefox plugin.
- Scuttle , a PHP clone with extensive del.icio.us API support.
- del.icio.us dire.ctor , an Ajax overlay.
Since Yahoo is tanking and they’ve never really done anything with del.icio.us, I keep around this quick and dirty way to back up your entire URL collection with wget (first spotted here, which also includes some iCal and AppleScript voodoo, updated):
wget --http-user=delicious-user --http-passwd=delicious-pass -O backup.xml \ http://del.icio.us/api/posts/all