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At noon PST today (about now), the social news tracker Tailrank is launching Spinn3r, a solution that opens up the company's spidering infrastructure so that other services can build applications on top of the blogosphere. Founder Kevin Burton has mentioned on his blog before that Tailrank was offering its "clean" index to outsiders, so it's no surprise that they already have more than 6 customers signed up for the service.
The services offered include spam prevention, ranking, indexing, language categorization and pinging - handy for those building any tool based around blogs.
Tailrank's rivals include Techmeme and Megite, which powers Mashable's own Mashtracker.
For a full roundup, see Rise of The Memetrackers.