Now this is cool (PDF). Link comes courtesy of a slashdot news item (yes I am not doing much work at work today!).
This is more of a heads up than a discussion, if you need to discuss the usefulness of this feature, probably best not to use it just yet.
Now to see if I can write my own.
Still not underestimating the power...
There is no such thing as bad information - There is truth in the data, so you sift it all, even the crap stuff.