spinnerTailrank has opened up their back-end API, Spinn3r.  Spinn3r is a web service that companies can use to index the blogosphere instead of having to write their own spider. Instead of spending months designing a scalable backend infrastructure and fighting spam you can just start using our spider tomorrow. Tailrank is indexing over one million blogs with a post volume of over 25k new posts per hour being added to their index.