Its based on ShashTags and has API. I can not find how to add/edit my SlashTag via an API. Since I run a directory that would really help them, its a bit of a pain.
You can embed a slashtag search box on your own site.
And you can hit us on rss by adding /rss to any search.
We intend to fill out more APIs after the launch.
The goal was to first get the site open to humans..
To create slashtags from your existing data, you can paste in lists of links, or upload a text file containing links.