We've mentioned blog tracking service Umbria before but we thought we'd point out a nice write up of the, by james Cormier:

There are now quite a few companies that claim to be tracking the blogosphere, but from what we can tell, no one does it like Umbria. The ability to filter spam out of the hundreds of thousands of posts that their system sometimes deals with is astounding. It's far from perfect, but likely the most reliable source for obtaining demographics and identifying trends from consumer media content.

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